Pur Pony
11-13-2001, 09:23 AM
Ok- just installed a yopshimura race pipe/header on my '01 400ex. Im also going to have a K&N and vented airbox. I talked to a few guys on here and they recommend using a 155 or 160 main jet.
Yoshimura e-mailed me saying 2 steps up on main(148 factory)- so that should put me around a 152 main jet correct???
also... do I have to change my SLOW jet and or my SLOW AIR jet??
Someone said on here to run a 40pj??? what is that?? Im guessing a larger SLOW jet??
and how do I change the setting on my needle groove- YOSHIMURA says #2 on the needle groove?
last of all... how do you read a plug??
After changing jets how far or how long to you run it before taking a plug reading?? and should this be tested using a NEW plug or the plug thats been in since i got the machine?
thanks for all the help- im new to playing with bike carbs-.. well really any carbs-
im a EFI guy- lol
thanks much
Yoshimura e-mailed me saying 2 steps up on main(148 factory)- so that should put me around a 152 main jet correct???
also... do I have to change my SLOW jet and or my SLOW AIR jet??
Someone said on here to run a 40pj??? what is that?? Im guessing a larger SLOW jet??
and how do I change the setting on my needle groove- YOSHIMURA says #2 on the needle groove?
last of all... how do you read a plug??
After changing jets how far or how long to you run it before taking a plug reading?? and should this be tested using a NEW plug or the plug thats been in since i got the machine?
thanks for all the help- im new to playing with bike carbs-.. well really any carbs-
im a EFI guy- lol
thanks much