[Jetting questions..] - ATV Riders Forums - Honda, Yamaha, Suzuki, Kawasaki, Polaris, CanAm, Arctic Cat, Kymco ATVs

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Jetting questions..
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Posted by: shorgasm

Need to know the stock
1..Main #
2..Needle position and #
3..Pilot size and #
4..A/F screw turns

Then suggested for slip-on and full pipe.

I'm gonna dig into this carb and check out what this cat has done to it....His lack of care/knowledge on the rolled rear sprocket makes me curiuos as to what he did when the stock pipe was cleaned out...lol

Posted by: TunedPerforman

the stock setting is

1..Main #148
2..Needle position and #3rd
3..Pilot size and #38
4..A/F screw turns 21/4 from closed position!

Posted by: shorgasm

Cool...now how's about some piped settings?...

Also found the left rear lug on backwards....How they managed that I have no idea.There friggin acorn lugs for gods sake.

Posted by: 440exnacsracer

jetting specs vary from one manufacturer to another. i would suggest contacting the company that made your exhaust and ask them for a jetting range, and then fine tune from there.

Posted by: cals400ex

with just a pipe, i would start with a keihin 152-155 mainjet. however, the elevation, temperature, humidity, etc all play significant roles in jetting.