jets for 400ex carb on a 350x

[Diedrich]

alright im doing the 300ex/350x conversion. im using a 400ex carb with the 350x motor and was wondering what size jets i should use. it will have stock 400ex pipe for a lil while. i have a k&n airfilter. the motor is stock. so does anybody have any idea? should i just leave the stock jets in or change em?

[scooter8]

I use to have a 400ex carb on my old 350x it worked good made huge mid to top end increase.My motor had a 10.25:1 piston and a web cam,rockers,spings and pipe.The jets I ran was stock 38 pilot stock needle position and a 145 main jet.On a stock motor I would start around 138 to 140 range main jet.

[H440exconfused]

Originally posted by scooter8
I use to have a 400ex carb on my old 350x it worked good made huge mid to top end increase.My motor had a 10.25:1 piston and a web cam,rockers,spings and pipe.The jets I ran was stock 38 pilot stock needle position and a 145 main jet.On a stock motor I would start around 138 to 140 range main jet.


Yea!!!!! What he said. I aggree start there

[Diedrich]

thanks guys..what size are the stock 400ex pilot and main jet?

[H440exconfused]

Originally posted by Diedrich
thanks guys..what size are the stock 400ex pilot and main jet?




Pilot is 38

Main is 148