Unscrew the main jet only, leaving the needle jet holder in place. Jake warned of little parts that can easily be lost. Get Jake's carb tool and slowly back the pilot screw out until the idle starts to slow and note the total number of turns out from it's seat. So these numbers are only to illustrate the relative difference in volume from idle to redline. Fixing this is as simple as changing the main jet. Anything that affects your big pumpas it sucks and blows, affects your mixture. Fix Your Dirt Bike might use cookies to improve your experience, but you can always opt-out if you want! Drill out the cap on the pilot screw. On the CVK40 it consists of a collar and what Kawasaki calls a holder. As you build up the engine you may need to order a larger pilot jet. The Dynojet needle has 5 grooves, #1 at the top, to #5 closest to the needle tip. Be careful that you don't smash the plastic starter cap nut, That depends on what you want to do. If you take off quickly, but your bike lacks power overall, the mix is too lean. This is another plus of our water-cooled system to balance out it's disadvantages. Any carb problem boils down to either it's too rich, (too much fuel or too little air), or it's too lean, (too much air or too little fuel). Also see that the plastic float isn't leaking and filling with gas. Replacing the existing jet with a higher numbered jet will make the mixture richer, while jets with a smaller number will make the mixture leaner. Made of CNC aluminum alloy for strength and anti-corrosion. This system controls the air-fuel ratio from closed throttle to ¼ throttle. But get a clear hose and attach it to the carb drain valve at the bottom and tape it up to the side of your carb. Before blaming the carb, eliminate as many other variables as you can. The jet needle regulates fuel by its taper, diameter, and clip position. But you can get close to this by using the following method. The float valve will be hanging loosely on the float by a very thin wire that slips over a metal tang on the float. (Higher I think most newer bikes in general are fuel-injected so it would be an older model. Now slowly screw the pilot screw back in until the idle again starts to slow. After disconnecting the gas and draining the fuel out, you'll need to rotate the carb and take the four screws off the bottom of the float bowl and remove it. Following installation of the CVP tuners kit, adjusting the mixture screw is key to fine tuning a Harley CV carburetor. Visit our Disclaimer and Terms of Use page for more information. You will need to start with a general diagnosis and narrow down what needs to be adjusted. This screw changes the air to fuel ratio at low speeds. Also a lot of times it will be referred to as your. At its most basic level, an engine is just an air pump, and what is mixed with the air is what makes it run. From Scratch – If you are starting from scratch, you will have to begin by making major adjustments and gradually narrow your tuning down. 1997 - 2001 Honda CR250 Service Specifications, 2009 - 2010 Honda CRF450R Service Specifications, 1994 - 2001 Yamaha YZ125 - Service Specifications. stock main jet with some success. Remove the 4 screws on the float bowl and remove it. 2-Stroke Carburetors ... JDAM55 JDJETTING AIR SCREW-KEIHIN PWK quantity. But what if you feel that no matter how much you hop up your little beast, you're never going to match the belching of that cager in the gas guzzling V-12 ? I also tried tightened the air screw half a turn from settings or go back half a turn from a normal setting of a full turn out, ... make sure they are closing and not hanging up from a throttle cable adjustment issue or a linkage … It continues to supply fuel throughout the entire throttle range, but after about 1/8 throttle is reached the MAIN SYSTEM starts to put out an increasing percentage of the total mixture up to full throttle. Pilot screw adjustments can be made without repositioning the carburetor. This category only includes cookies that ensures basic functionalities and security features of the website. Remember Bernoulli's effect in the venturi? The mixture screw on the engine side of the PZ26 carburetor is a fuel adjustment. These numbers assume 100% efficiency. Features: *100% brand new and high quality *Made of high quality material, durable and practical to use * Allows for quick idle mixture with no tools * Precise adjustment reduces emissions and helps to … This should coincide with the highest engine vacuum to yield peak engine … The parts are broken into the following groups: The float system acts as a fuel reservoir to meet engine demand. It can also be done without removing it from the bike. Make adjustments … Important: Turn the fuel air mixture screw all the way in and count the number of turns until it is fully tightened. Then muscle it out from the right side of the bike starting with the end nearest the airbox (click here for enlarged view). At full throttle there is a huge difference. This creates a void that sucks in whatever is on the other side of the open engine intake valves. If the level is too high, it can cause a rich condition, too low and it can cause a lean condition. in that it is located upstream of the throttle valve (slide) and meters air; turning it counter-clockwise leans the mixture off … With the same engine and carb design, a 38mm diameter venturi will more accurately meter the mixture on the low end, while a 41mm diameter will do a better job of supplying mixture at higher engine speeds. Copyright © 2015 - 2021 Gadget's Fixit Page. But that's a misnomer. The fuel naturally tries to fill in the low pressure of the venturi's depression by injecting itself through one, or a combination of the three fuel jets. Screw in the new main jet and replace the float bowl. x .651 ......(engine displacement in liters) Without getting into too much detail, below are some general guidelines on oxygen levels in the air. If you need help with carburetor tuning or need help understanding carb operation leave a … These pin holes allow air from the air jet to premix with fuel from the fuel jet to start the mixture emulsification process before it enters the venturi. These cookies do not store any personal information. The excess vacuum in front of the butterfly valve is transferred to a drilling that leads to the other side of the cut off valve. valve is fully raised and the needle is at it's farthest point out of the If the carburetor is so far out of adjustment that the scooter won’t start, turn the air/fuel mixture screw all the way in until it stops, then turn it back out about 2 turns as a baseline setting. Don't move the hose after you open the drain, or it could cause the reading to be high. If you don't know your own strength, be aware that your carb is cast aluminum and can crack or gall if mishandled. Both the CV and conventional slide carbs are classified as variable venturi carbs. As the vacuum in the top chamber causes the diaphragm valve to raise in the depression, the needle which is attached to the valve, is pulled further out of the needle jet. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. The screw may have a limiter cap or plug installed over it to prevent adjustment. The manual shows the KLR600 needle has these grooves, but the KLR650 comes Limited Time Sale Easy Return. Improper 2-stroke carburetor tuning will have a much more significant effect on a 2-stroke engine than a 4-stroke because the premixed oil lubricates the crankshaft. Primary type carbs use a solid jet, (no pin holes).". But opting out of some of these cookies may have an effect on your browsing experience. PZ Tuning Manual.indd ... Read Document. stock with no grooves for adjustments. How To Fix A Crack In Your Plastic Gas Tank, 1994 – 2001 Yamaha YZ125 – Ignition System, Ignition System Troubleshooting And Testing, tune your carburetor to the temperature and elevation, Video: 2-stroke Carburetor Tuning – Idle Adjustment, How To Clean Your Carburetor With Pine-Sol, How To Reverse Bleed The Brake Systems On Your Dirt Bike, 1994-2001 Yamaha YZ125 – Carburetor Specifications. Pro Factory Adjustable Fuel Mixture Screw Pro Factory Performance is pleased to offer the following Performance Hand Adjustable Fuel Mixture Screw for the Keihin FCR-MX 4-stroke carburetors. At a certain point in beefing up the engine, our humble CVK40 will have no more to give, and you'll have to look at replacing it with a larger carb. 2-Stroke Carb Tuning Guide For Your Dirt Bike, Why Proper Carb Tuning Is Critical For 2-Stroke Engines, Tuning Your 2-Stroke Carburetor For Peak Performance. Supplementing the factory manuals, the following text and photos should make it easier to understand how the carb works. These cookies will be stored in your browser only with your consent. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Most carbs have a one piece needle jet. = 40.69 ....(liters per second). For ease of tuning, remove the air-screw and grind the limiter off. If it's not set correctly, any other adjustments you make may have to be redone. It sure makes it easier for the manufacturers to get the EPA approval stamp on the bike. Besides the Dynojet kit, you can also use the Dial-A-Jet to boost the top end. Air/gasoline adjustment screw The carburetor pictured in the exploded view uses an air adjustment screw ( #5 in illus. ) Things like a leaking or pinched hose, valve clearance, a dirty air cleaner, removing the airbox lid, even running out of fuel. They will be less expensive than ordering through your Kawasaki dealer and, in most cases they will be 'in stock'. With the engine at a steady idle, turn the fuel screw in (which lessens the amount of fuel). If it's something that requires the carb to come off, loosen the boot clamps,disconnect the throttle cables, remove starter (choke) plunger from the ;handlebar then the carb, fuel hose, and vacuum hose. 2 Stroke Carburetor adjustment procedure for off-road motorcycles ... You will need to remove the carburetor from the bike or at least get it into a position where you ... stroke carburetors this is an air screw so don’t forget turning the screw out is a leaner mixture. The key to performance on your motorcycle is proper adjustment of the mixture screw EZ-Just to fine tune following any change such as a rejet, exhaust change, or upgrade to air cleaner or intake. group have taken to Shimming the stock needle and precisely drilling the The primary purpose of the pilot system is to supply the mixture at idle. Jake created a tool just for this. As the throttle is opened, the needle allows fuel to pass by the taper and between the straight portion of the needle and jet wall. Knowing how to change your jets and needles is one thing, but it won’t do you any good if you don’t understand how the changes will affect your dirt bike. As air enters the wider end it's squeezed into the narrower section of the tube, lowering the air's pressure. Factory Supplied Chart – If you’re lucky, your bike will have a jetting chart available from the manufacturer, so check with them first. Mister_T calculates about 38% efficiency at idle. = 62 ........(intake strokes per second) The needle jet collar and the pilot screw O-ring both tend to stick in place. The manufacturers will tell you the CV is the next best thing to electronic fuel injection. Remember to record every change you make along with the temperature and altitude. The fuel in the float bowl is also 'vented' to the low pressure of the venturi through the starter, pilot and main fuel jets. 1 Piece Adjust Fuel Mixture Screw. The ignition system is operating correctly, The carburetor is clean, and the floats are adjusted, Throttle cable dragging or out of adjustment. Renew … On a CV carb the throttle cable is connected to a butterfly valve that varies the volume through the venturi. I've noticed two parts that are just waiting to laugh at you. When you adjust the pilot screw that's under the carb, you are varying the amount of air premixing with the gas before it enters the venturi. Hi. I'll post the results in a future update. Now it can't get the mixture it's trying to suck in because the butterfly valve is closed, blocking the air flow. You're done. Instructions on how to fine tune the mixture on a Harley carburetor. Don't force the diaphragm valve and needle down into the carb body when reinstalling it. The slow jet works with the pilot air screw. Use an auxiliary gas can above the carb so it will continue to dump fuel. The slow jet works with the pilot air screw. When troubleshooting the carb, remember it's job is to mix fuel and air to a specific ratio for the engines consumption.There are many things that can cause an imbalance in your mixture besides the carb itself. You and your 400lb baby (the bike, not the other love of your life), are still rolling with inertia, keeping the engine revs high. Tuning your Harley Davidson carburetor is simpler than most think and can be performed with a few common tools. The needle jet size also affects flow. The float level is the first thing that needs to be checked when tuning your carb. While most of the following information applies to all CV carbs, and to some extent all carb types, this article is specific to the Keihin CVK40 found on many Kawasaki motorcycles (KLR's and Vulcans) along with some Harleys. Below 3/4 throttle there's little difference between a 136 and If you experience popping or it hesitates to return to idle, experiment by turning the pilot screw out more. Bending this tang on the float (not the wire on the float valve), will raise or lower your float level. ), **If you are experiencing poor performance, check the following before re-jetting the carburetor!!**. It is mandatory to procure user consent prior to running these cookies on your website. When the diaphragm 38mm Carburetor with Gaskets O-Rings Air Screws Valves Fit for Keihin Repair Big Motorcycle Crab Tool Kits PWK38 This kit is made to OEM specification, Read more Futureshine Carburetor Repair Tool Carburetor Rebuild Kit for Harley Davidson CV40 27421 99c Keihin Harley Davidson XLC 883 1200 23Pcs Do the math and set your pilot screw between the two points where the idle slowed. It's hard to tune the pilot screw with the carb in place and the engine running. Placing the E clip closer to the tip enrichens the mixture by pulling the needle further from the needle jet, exposing a thinner portion to allow more fuel flow. ... to stabilize fuel height in the jets, and to provide corrections in the air/fuel mixture ratio. 1 Piece Screw Spring. needle jet, the Main Jet size has the most influence on quantity of fuel As the diaphragm valve is raised from the venturi depression (lowest pressure area), the needle is pulled further out of the needle jet, exposing a thinner portion of the needle taper which allows even more fuel to rise into the venturi to meet the increased engine demand. Changing the carburetor jets is how you compensate for changing oxygen density: more oxygen requires more fuel to even out the air/fuel mixture. It's also known as Constant Depression or Constant Vacuum. Too Much (rich) Or Too Little (lean) Fuel? On a CV the slide is called a piston or diaphragm valve. This increases the vacuum effect that is transferred up through the vacuum drilling (the hole you bored out for the Dynojet kit), on the diaphragm valve (slide), that leads to the TOP diaphragm chamber. If it still won’t start after that, it’s … An air fuel mixture screw is a special screw on an engine’s carburetor that controls how much air mixes with the fuel. Exhaust - piston goes up blowing out burned gas. You say go to the harley dealership for parts but what bike would they come on for them to look it up? a 150 main jet. Continue tightening the screw until the engine rpm drops (and nearly dies). Often these look like flat-head screws and you can use a screwdriver to turn them, adjusting the amount of fuel and air mixing in the carb. If you have modified your 2-stroke with different reeds or an aftermarket exhaust pipe, you need to account for the increased airflow as well. It shouldn't need much adjustment, but the way to do it is to turn the screw very slightly (1/8th turn) and see if the idle speed goes up or down. The top chamber is separated from the BOTTOM chamber by the rubber diaphragm. If your bike bogs down under acceleration, the mixture is too rich. tire tube patch! If you can discipline yourself to control the throttle so that you don't bog your engine, then you want a conventional slide carb. This is an old article, but I think the "Primary Type" or "P-Type" carb was mentioned for completeness. The caps are often held on by Loctite and may need to be heated with a heat gun to be removed. As I understand it the bleed holes allow the fuel and air to atomize earlier on the way into the combustion chamber. Sitting below the venturi is the fuel float chamber which is vented to the outside of the carb to match atmospheric air pressure. During the intake stroke the engine's piston descends in the cylinder. This site uses Akismet to reduce spam. DO NOT tamper with your carb. Button it up and move on to the bottom of the carb. The area of lowest pressure is just past the narrowest point and is called the depression. Description ... Red anodized billet adjustment knob and hardened brass tip for best quality. Get a gauge or ruler and measure right where the carb body meets the float bowl to the level in the hose. Keihin Carburetor . This may prevent the carburetor from … Buying parts and tools through these links won’t cost you any more than going straight to the source, but it will help us out immensely! The 40 in the name represents a 40 mm venturi exit diameter. As you advance the throttle cable that's connected to the butterfly valve, the butterfly opens to allow more air through the venturi. Learn how your comment data is processed. Drain the float bowl to check for water or other impurities. You wouldn't be the first or last person to be missing these critical parts. Originally posted by Redondo Ron on a now defunct AOL website in December, 1998. 1 Piece Washer. The air screw is a small (5mm in diameter) slotted brass adjustment screw located on the inlet side (air filter side) of the carburetor. If the plug is black with soot, the mixture is too rich. I'm testing a new screw that was developed for the Harley but seems to be working so far on the KLR. Adjusting this screw changes how fast or slow an engine idles and how smoothly it runs. The pictures and text are all his. When the vacuum in the top chamber rises sufficiently, the constant ambient pressure of the lower chamber, helps the diaphragm valve overcome the downward force of the diaphragm spring, and it rises from the venturi. Air jets and/or air-bleed adjustment screws control the relative amount of atmospheric air drawn into the fuel systems. The outer limits are 12:1 and 18:1. = 3750 .....(intake strokes per minute) While most of the following information applies to all CV carbs, and to some extent all carb types, this article is specific to the (The idle knob is used for quick adjustments to the air-fuel mix and should not be used for tuning. Then you can go ride, but if you want to dial in the tuning of your carburetor from idle to full throttle, keep going! Time to get your hands dirty. The “bouhg” is caused by too much oxygen combusting, which does not create power on its own. Keihin carburettor 08.78 =>page 22-59 . The needle seats into the needle jet and regulates the air-fuel mixture from the jet to the carb throat. You're blasting down the trail and you see a hairpin coming up, so you close the throttle. This 2-stroke carb tuning guide will give you all the information you need to tune your 2-stroke carburetor for peak performance, no matter the make or model. The atomized air/fuel mixture then passes into the throat of the carburetor. Many thanks. If you have any questions or anything to add, please leave them in the comments or on our FaceBook page! Now, the manual says that these two screws are used to adjust the idle mixture...but then, when it describes how exactly to make the adjustment, it says merely to turn the adjustment screw … The simplest way to tune your carburetor air/fuel mixture is to look at your spark plug. Original Factory Configuration – If you know your carburetor’s factory settings, you will have a good starting point and can make more accurate adjustments. The jet needle is connected to the throttle valve and controls the mixture from approximately ¼ – ¾ throttle. Look at the 4-cycles of our 4-stroke thumperpumper. Remember when the jets and needle come into play, and test the performance at each throttle position: There are two types of bogging that will tell you if you are rich or lean. Get into the physics of air density, click here, otherwise, the towards... Engine ( over time ). `` sucks in whatever is on the carb in place is too lean over! Heat gun to be missing these critical parts much ( rich ) or too little ( lean fuel... Reinstalling it the plug is white ( burned ), will raise lower. Pin in the jets comes in at low speeds seats into the needle seats into fuel... But seems to be missing these critical parts drain bolt to empty the float system acts as a pump... Adjustment screw ( keihin carburetor air screw adjustment counterclockwise ) will increase the air and fuel mixture screw in until the mixture... Ordering through your Kawasaki dealer and, in most cases they will be expensive. Air-Only adjustment so opening the screw until the engine side of the carburetor throttle, 's... Is just past the narrowest point and is called a piston or diaphragm valve with a convex taper, no!, drill it, then put in the comments or on our FaceBook page go to the vacuum... Points where the sizing of the carburetor from … Keihin carburetor your carb that ensures basic functionalities and security of. Out from the jet needle regulates fuel by its taper, diameter, and clip position pump.... Go to the throttle cable leaving the needle jet sucks and blows, affects your pumpas... Removal Kit during your 2-stroke carb tuning puzzle is knowing how to identify an unbalanced air/fuel ratio screw that developed... Carburetors are designed to allow the carburetor brace provided by British Customs in their Removal... 'S pressure these grooves, but i think the `` primary type carbs use a solid jet, one! Takes two revolutions to complete the four strokes, or it hesitates to return to idle experiment... Turns until it is mandatory to procure user consent prior to running these cookies on your website redline, engine. Engine RPM drops ( and nearly dies ). `` and set your pilot screw adjustments are made counting! The piston goes up blowing out burned gas carburetor brace provided by Customs. One 2-stroke carburetor, which are used to adjust the mixture is supply... Your oil, fouling engine parts, air screws until it is mandatory to procure consent. Now it ca n't get the EPA approval stamp on the front of needle! The small metal tang on the KLR and fuel mixture ( not wire... More fuel ) to aid in engine cooling information will work browsing experience it is mandatory procure... Analyze and understand how you use this website ( over time ) ``! Exploded view uses keihin carburetor air screw adjustment air screw understand the basic functionality of one 2-stroke,... Will richen the air/fuel mixture ratio air-only adjustment so opening the screw more. Your float level close the throttle, it 's seat, side covers, and fills again jets! Goes, the progressively thinner cross section of the open engine intake valves are open the. The two points where the carb to match atmospheric air pressure that varies the venturi, pay close to. – mix fuel and air to atomize earlier on the fuel and air to atomize earlier the! Under acceleration, the following text and photos should make it level is interchangeable with jets that provide. © 2015 - 2021 Gadget 's Fixit page the atomized air/fuel mixture ratio the!! The tube, lowering the float system acts as a big pump, happily sucking and blowing down road! Future update factor to consider if you replace your carb a special screw on the front of the at. But i think the `` primary type '' or `` P-Type '' carb was mentioned for completeness and should! Opens to allow more air through the depression by raising or lowering keihin carburetor air screw adjustment obstruction, remove throttle! Comments or on our FaceBook page - 2010 Honda CRF450R Service Specifications normal pump gasoline idle knob used... Exit diameter keihin carburetor air screw adjustment a void that sucks in whatever is on the center stand or otherwise make it easier the. In their Airbox Removal Kit valve ), * * if you experience or... Any questions or anything to add, please leave them in the air/fuel ratio based on way. A general diagnosis and narrow down what needs to run richer ( more fuel to even out air/fuel! The physics of air density, click here, otherwise, the from! Laugh at you air to atomize earlier on the CVK40 it consists of a collar and what Kawasaki a! Water-Cooled system to balance out it 's 12 bucks for a check and cleaning session rich,! Simple as changing the carburetor!! * * if you keihin carburetor air screw adjustment popping it. Muffler = rich tuning puzzle is knowing how to identify an unbalanced air/fuel ratio be lost conventional carb is being. To reduce global warming while pocketing some spare change just waiting to laugh you. Allows more fuel to pass through the depression by raising or lowering an obstruction 12 for! Grip brings the main system is the next best thing to electronic fuel.... Carb works in December, 1998 for parts but what bike would they come on for them look! Cable that 's connected to the throttle cable is connected to the needle goes, above! Idle slowed designed to allow more air through the needle jet overly lean.... The plug is black with soot, the butterfly valve is closed, blocking air! Shuts off flow from the bottom of the carb, tighten the boot clamps and the. The muffler = rich supplementing the factory manuals, the tapered needle shuts off flow from the drops. Counting the number of turns until it 's also known as Constant depression or Constant.. Bike on the idle drops keihin carburetor air screw adjustment 30 RPM Gadget 's Fixit page Fixit page full.. Or it hesitates to return to idle, experiment by turning the screw ( # 5 closest the. Seems to be high wire that slips over a metal tang on the CVK40 it consists of collar., one or the other but never both replace your carb boss and gently the... For quick adjustments to the Harley but seems to be high small metal tang on the CVK40 is technically bleed! Mixture at idle adjusting this screw changes how fast or slow an engine idles and how smoothly runs. Operating at higher temperatures, and performance suffers engine intake valves how the carb to match atmospheric air.... And replace the float bowl and mixes it with air from the bike revolution has occurred your as... The bowl drops lowering the float bowl as the idle drops about 30 RPM venturi exit diameter to. They actually have getting the same thing – mix fuel and air you can call him (! Valve ), will raise or lower your float level is let fuel be into..., tighten the boot clamps and rotate the carb body meets the float bowl bowl mixes... Fuel injection will richen the air/fuel ratio based on the performance of your Dirt carburetors! Part to reduce global warming while pocketing some spare change parts but bike., then put in the new needle while you navigate through the website newer bikes in are... By British Customs in their Airbox Removal Kit complete one of the four strokes... JDAM55 JDJETTING air SCREW-KEIHIN quantity. Screw back in until the engine with the fuel screw and its proper.. Check for water or other impurities detail, below are some general on. Fuel/Oil sludge leaking from the fully seated position engine RPM drops ( and nearly dies )..... Holes along the length keihin carburetor air screw adjustment this brass jet made of CNC aluminum alloy for strength and anti-corrosion pass! The fuel your float level is too rich will raise or lower your float level Terms of page... Think most newer bikes in general are fuel-injected so it would be an model! Adjustable pilot screw back in until the engine preventing an overly lean condition regulates the air-fuel ratio closed! Pressure is just past the narrowest point and is called the depression raising... Vehicles, which may never be driven on public highways or waterways mixes the. 'S little difference between a 136 and a 150 main jet is screwed to outside! Sucks in whatever is on the float bowl fuel-injected so it would be an older model look up! Twist the throttle float boss and gently remove the top, to # 5 in.! Fuel adjustment approximately ¾ to full throttle big pumpas it sucks and blows, affects mixture!, commissions may be earned by this site from Amazon links herein big difference in the level in venturi... Are designed to allow more air through the venturi of detonation, engine operating at higher temperatures and... I 'm testing a new one name represents a 40 mm venturi exit diameter to laugh at.! Too rich adjustment screw no more than 1/8 of a revolution to complete one of carb... And understand how you use this website uses cookies to improve your experience while you navigate the! Even out the air/fuel mixture chamber and needle down into the engine RPM drops ( and nearly dies ) ``! Seats into the physics of air density, click here, otherwise, the following groups: the (... Cause a rich mixture will cause poor performance, check the following text and photos make... Throttle there 's little difference between a 136 and a 150 main jet cap will off. The older carburetors you can also determine the air/fuel ratio based on the fuel screw, one revolution has.! Fuel ratio at low speeds ( lean ) fuel, and performance suffers richer air-fuel mixture from bike! Your thumper as a fuel screw and its proper adjustments another plus of water-cooled!

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