My bike has surprisingly gottin to be not fast enough for me. When I first got the bike I thought it would always be to much bike for me, well its not, I want to go faster. I have cut the throttle stop, removed the baffle and

air box cover, put in a uni-filter, went to a 52t rear sprocket, put full synthetic in, renthal non-o-ring chain{less drag}. It runs damn strong but what can I do to give it a bit more power all threw the rpms?

So, tell me, have you been reading the posts? :)

Well,there are many things to do (I am assuming you are refering to the engine) and they are:

- New Pipe

- DSP Airbox + velocity stack

Other non-motor related mods:

- Suspension

- Steering damper

I hope this helps. Trust me on the airbox, makes a huge difference


You want your bike to go faster?

Try changing the 52T sproket with a 48. That ought to make it way faster! :)


Try one of the opional YZ426 carb needles EKQ or EKP (5JG-14916-E1 or EP). Clip #3 from top to start with. They will richen the fuel mixture at 1/2 to 3/4 throttle. Minimal change will be noticed down low. See the posting "YZ426 Jetting Boosts YZ/WR400 Midrange Power".

James Dean

[This message has been edited by James Dean (edited 07-20-2000).]

I (think) I am in negotiations with FMF on the DSP airbox. I hope to hear something SOON from their sales department!!


99 WR, all YZ mods, de-octopused, OEM YZ tank and IMS seat, jetting by Clark, got forked by Pro Action, WAITING IMPATIENTLY FOR MOAB!!



has anyone ever mentioned how cheap carbon fibre is. the mark up at $500 is absolutely huge i'm sure. go nail em kev!

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