Jetting after taking off lid

[howshnazy]

What size Keihin jet should i use after taking off my airbox lid? everything else is stock.

[cals400ex]

what temperature and elevation you ride at?? typically, i found it best running with a keihin 150-152 with just a removed lid.

[howshnazy]

way low elevation like not even 200 ft above sea level. And here in arizona it goes from the lowest about 40 to the highest about 120 degrees.

[440exnacsracer]

i would try 3-5 over stock,....stock is 155 right,...so 160

[hondarider2006]

Originally posted by 440exnacsracer
i would try 3-5 over stock,....stock is 155 right,...so 160

wrong. Stock is 148. If the only mod you have done to your bike is remove your lid, than I wouldn't go any higher than a 152. Put a 150 and do a plug test, but that should be good.

[cals400ex]

yeah, a 152 or 150 should be good.

[howshnazy]

Thanks guys. :macho What would my jetting need to be with no air box lid and a k&n? Everything else still stock.

[jmpulse]

Originally posted by howshnazy
Thanks guys. :macho What would my jetting need to be with no air box lid and a k&n? Everything else still stock.

Most likely the same. Your limiting factor is going to be the exaust. When I first got my quad, I pulled the airbox lid, and never had an issue with the stock jetting. You might want to concider uping the pilot jet, it seems to make a big change in starting.

[440exnacsracer]

wrong. Stock is 148. o well, close:rolleyes: been a while since i worked on a 400