[YZ426 pilot jet size] - ATV Riders Forums - Honda, Yamaha, Suzuki, Kawasaki, Polaris, CanAm, Arctic Cat, Kymco ATVs

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YZ426 pilot jet size
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Posted by: CSR400EX

just wondering what size pilot jet you YZ426 hybrid owners are running. i think my pilot is not right. my mods are stock motor, Pro Circuit head pipe, FMF titanium 4 muffler, UNI filter with no lid, stock carb with AP mod. i did search but didnt come up with much to help me. when i push the throttle to around 1/4, and im pushing pretty fast, it revs good the first push, then the second time it dies.

Posted by: markvette

we run a 45 in ours. you may need to do the bk mod to the carb. i will see if i can find the link to the mod. i found it on thumper talk.

Posted by: atvfreak400

I have the same thing going on with mine as long as you keep your throttle past 1/4 its ok but let it drop below that and it tries to die let me know what you come up with.

Posted by: CSR400EX

after playing with the fuel screw and doing the BK mod, its better but not completely gone. i think im around 3 turns out on the pilot, got the pump squirt down to about .4 seconds or so, 172 main. if i can get it any better i will post my settings up

Posted by: Tim1970

i put a POWER NOW in mine and the dead spot on the bottom is almost completly gone