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I'm currently running my 400EX completely stock. Im going to put a K&N Air Filter, and a White Bros. E-Series Slip On, on my quad. Im just wondering how much I will have to change my jets in order to make it run well. Just thought I would ask before I start pissing around with it.
Thanks
Adam
When I had those mods, I bumped my main up to a 155.
I live at sea level and am running stock engine e-series slip on, k&n filter with modified airbox. I run a 160 main and drop the clip one position on the needle. It runs great! hope this helps!
I have an w bros R4 and K&N filter and ive been running 155 man jet...