Newbie w/ a few questions

It's been a few years since I've been on a bike so please forgive my ignorance. I'm now riding a '00 WR400.

(1) When you talk of removing the air box cover are you refering to the entire lid or just the smaller "snorkel" piece where the air currently is let in??

(2) I tried removing the entire lid, the exhaust baffle and put in the shorter YZ throttle stop. I haven't had a chance to ride her much since, but on the maiden voyage

there was a noticable hesitation when I first cracked the throttle (she almost died)unless I rolled the power on slowly. I'm assuming a jetting problem but wasn't sure if a complete re-jet was in order or if there may be a more simple fix.

I'm planning on going with the YZ timing and a new pipe/silencer soon so if a complete re-jet is on order maybe I should just deal with it for now as I'm assuming another re-jet after the timing and pipe mods are complete.

Thanks in advance - Jerry

1- the entire lid

2- WR's and YZ's are very sensitive when it comes to intake or exhaust changes.




86TT225, 98CR80, 99WR, WR timing, throttle stop trimmed, air box lid removed, White Bros head pipe, silencer and air filter. Odometer and headlight removed. Moose hand and mud guards. YZ stock tank and IMS seat. Renthal Jimmy Button "highs" and Renthal Soft half waffle grips. AMA, SETRA.

I left the lid in place however; I used a utility knife and removed all but the perimeter of the lid. My logic is that by leaving the lid rim, I'll have a better chance of keeping water out that runs down between my seat/tank junction. Could be crap, just my .02 cents.

I have also removed my baffle and my jetting is just fine.

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