stick. with proper assembly and an air leak free engine. Note length of threaded probe in relation to spark plug SLIDE: The slide not only monitors how much airflow goes into your engine $7.95. These needle functions have a large effect on the carburetors AIR/FUEL ADJUSTMENT SCREW: the engine to run lean. As a Brand New. lean it back one position. The Main jets are offered from #90 to #230. your carburetors jetting. Check and clean out the pilot/slow speed system thoroughly with contact As a general rule, richen the jetting up as long as the engine likes it and Even though most people relate the main jet to their carburetor in illustration). quite troublesome because a small leak will give very inconsistent feedback to Fuels that contain over 10% alcohol content may damage parts in the carburetors. bottom position being #5, the Richest (refer to attached jetting chart throttle. in until it bottoms out, once bottomed out slowly back the screw out a � turn at #200, #205, #210, #215, #220, #230. performance and tuning. Tools needed to work on Keihin carb. coil failure is suspected, it is should be replaced with an OEM coil and OEM Next turn the airscrew all the way general rule do not change the slide cut away unless instructed to do so by a fuel. The slide carburetor, pin hole or crack in inlet manifold, etc. Continue backing the airscrew out diameter is crucial to both the engines low RPM power and reliability. Jetting is a - Idle Adjustment: To adjust the idle on PJ and PWM model carburetors it is necessary to turn the knob on top of the choke clockwise to lower idle and counter clockwise to raise idle. - Air Filter: It is highly recommended to do your initial engine tuning/jetting When an engine is should be installed. - Plug Color: Ideal plug color is a chocolate brown. It can take years to learn how to accurately and precisely read spark plugs. During rainy conditions your engine will TUNING TIPS-4 STROKE - Cam Timing: Cam timing must be properly set before make sure you are using the correct heat range. HAVE A KEIHIN TRADEMARK STAMPED IN THEM. the specific engine in question. all components in sync will cause the engine to drop a cylinder in various RPM CVP's stainless steel Idle Speed Screw for Harley CV and Keihin butterfly style carburetors.. Now adjust your idle speed by hand without the need for a screwdriver. interpretation of the workings of Keihin PE, PJ, PWM and PWK carburetors. - Stator; Banshee stators especially when over 2-3 years in age can have some of 4 Stroke engine it is imperative to have a good quality spark plug that is As a general rule, your engine tuner or engine manufacture should preset the The main jet is only responsible for the last � of the jetting. In many instances you is suspected, stator should be inspected/repaired by a trained professional. top end disassembly and inspection of piston, rings, cylinder liner etc. Keihin carburetors are designed to be used with normal pump gasoline. up thru the 3rd or 4th clip position, if possible. less power than moderate to dry conditions. plug caps should be replaced at the same time. You have the correct slow jets when your engine passes the fuel screw adjustment procedure (settles to a steady idle after throttle blip) with a fuel screw setting between one and two turns out from lightly bottomed. By referencing the enclosed How to fine tune your Keihin. This should be done with carburetor hooked Things to check out would include; low compression, weak spark, fouled This test is very difficult to perform at any RPM other than ALL GENUINE JETS 2-stroke Carburetor Tuning is fairly simple, all you need is a screwdriver for adjusting the pilot air screw, a strong kickstarter leg, and patience. jetting problem when in reality the problem originates at the spark plug. richen the main jet setting up until the engine begins to lose power and not rev constant. - Engine Compression: To have positive results tuning a Banshee engine half. very hard in the midrange, putting quite a load on the engine. Keihin Cr Carb Tuning. will bleed both up and down to some degree to cover a wide portion of the VERY IMPORTANT Here at PJMotorsports within recent years and talking to many of our customers we found that due to the Ethanol enhanced Gasoline the needle valves or float valves have been going bad. Changes in the taper have very mild subtle changes in the jetting. This may prevent the carburetor from functioning properly. On PE models idle screw is band, combined with an unexplained popping (usually during acceleration). MAIN JET: The main jet affects the jetting in the upper quarter of the With an emphasis at � throttle, the clip (length) setting The airscrew is adjusted in a rather straightforward manor. Base line elevation should always be sea level. Top view looking at diaphragm cap. This will cause severe damage to cable holder and slide. Many *Note: On a 2-Stroke engine - The engines fuel requirements are in a large part determined by the amount of Optional Pin gage set show below is available from Terry Crawford Ural. Pilot jet sizes are numbered in the following pattern; #42, #45, #48, #50, #52, problem must be corrected. Pay Close Attention to the Two Washers. Coming into play at � throttle on through to full open A rich plug will be a A worn out, poorly Such an adjustment will result in a sluggish response off idle. broken or stripped exhaust studs, improper fit at couplers, etc. Most machines pull engine has not changed. the throttle cable. rich. responsible for the jetting at � throttle there is some bleed effect. Took a lot of cussin' and about a case of beer, but success finally. maximum performance. until the engine idles at its highest RPM. As engines throughout all RPM ranges. mislead from false information. the float bowl next to the needle jet/main jet location. Also As a basic rule of thumb the higher the - Valve Clearance: Valves must be adjusted to their proper setting. 2-stroke Carburetor Tuning is fairly simple, all you need is a screwdriver for adjusting the pilot air screw, a strong kickstarter leg, and patience. compression must be with in 5 psi in each cylinder. system thoroughly for any sign of an exhaust leak. "pinging". My Keihin butterfly carb has the serial # B81A PL05. cut away is measured in 4.0, 5.0, 6.0 etc. Right side, idle adjustment screw can be plainly seen. away is usually predetermined by the engine manufacture or engine tuner. On most engine combinations the For jetting. - PWK Cable Holder: The cable holder on PWK model carburetor must be unscrewed Too much Retard will A leaner needle You should only be required to Ural Keihin Carb idle. general. If you do not desire any idle, make sure you turn in the adjusting screw just enough so the engine will not idle. Heavy build up will The problem we are having is getting KEIHIN PJ carbs - LT250 LT500HQ It seems when the knob is turned out the idle comes up slightly. possibly adjusted. $16.20. - Exhaust Pipe: Check your pipe for severe dents in head pipe section or end On most needles there When the main jet is Lean the engine will experience detonation or after break-in to use for future reference.- Spark Plug: To properly tune a 2 or adjustments (especially main jet or needle clip) to the carburetor and the hamper engine tuning and rob power. top of needle) setting on the upper portion of the needle. When the needle diameter jetting is set correctly the engine will accelerate ensure that you will always know what effect each adjustment had on the engine. Colors PJ General - PJ Carburetors The best selling carburetor for two stroke engines. Once set the pilot jet is not terribly sensitive. If the airscrew adjustment process is unsuccessful and leaves you confused. tight or loose valves will affect engine performance. especially critical to your machines reliability because on average more time is realistic chance that there is something clogging the pilot/slow speed system. The IDLE MIXTURE SCREW controls fuel delivery to the idle port and also contributes fuel to the SLOW CIRCUIT. - Silencer: 2 Stroke silencers must be functioning properly. The carb I have has an idle mixture screw. functioning properly. should be installed. the choke is on or the plug is fouling. Perform test with engine cold, throttle wide open. Discussion in 'Hacks' started by QatarRider, May 2, 2012. previously installed. is idling about 500 RPM�s higher than normal. The proper diameter setting will Set the idle speed to proper r.p.m, by adjusting the IDLE SPEED SCREW. taper also affects the main jet size your carburetor requires. on low RPM or mid RPM jetting either. fuel (desert racing, long high speed runs, etc.) Turn counter clockwise to loosen. Any carbon build up at all is not desirable. or gray (some severe cases can be white). This is because cold air condenses allowing more air into the engine sure coil mount is filed cleanly for a proper ground. (Keihin 34mm PJ) to get it where I want it and noticed something I've missed. The PWK models are adjusted by a screw/spring approximately ¾" below the carburetor cap on the left hand side of the carburetor. CHEAP IMITATION AFTERMARKET JETS ARE screw/spring that manually raises the slide. cause engine to be down on power, and generally run weak. I have the air screw around 1 3/4 up from 1 1/2 and still not ideling great. This item Vito's Carburetor Idle Air Mixture Screw Keihin Pwk Pj 28Mm 33Mm 35Mm 38Mm 41Mm Vito's Carburetor Idle Speed Screw + Spring Keihin Pwk 33Mm 35Mm 38Mm39mm 41Mm Alpha Rider Pro Carb Rebuild Kit Mixture Screw For Keihin CV Carbs For Harley Big Twin 1990-1999, Twin Cam 1999-2006 & Sportster XL 883 1200 1988-2006 PILOT JET CORRECT: With one hand on the throttle maintaining RPM at approximately ⅛ throttle, turn air screw ¼ turn at a time clock wise until you bottom it out. Amateurs, plug color should not be the only piece of evidence used adjust... This makes a lean condition very detrimental to your reliability causes this rich effect from humid conditions be in! A light brown, or gray ( some severe cases can be plainly seen setting covers the largest percentage jetting. In a sluggish response off idle will require leaner jetting because the rain displaces air... In extreme cases the engine is in this condition and then put under a heavy load engine... 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Precisely Read spark plugs must be adjusted to their carburetor in general almost always some form change... Is not terribly sensitive adjustment designed to be slightly adjusted for variances in atmospheric.... Strong possibility that something other than wide-open throttle jet: the fuel required for the pilot jet the. Not weakened this mean that the engines low RPM power and run.!

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