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Dirt Bike Brands - Other
White Bros XR4 Rev Kit
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[QUOTE="motoman393, post: 107867, member: 20557"] Hello all...I had a 97' XR400 (I still do because it is sooo much fun to ride) but anyway I only come to this site but about every week (I mostly goto thumpertalk.com) since I have a YZ426 now! Anyway about my XR400 that I had: engine mods were: ported and polished head, flowed head, new rev cam form WB, JE piston higher compression stock bore (11:1 if I remember correctly), WB high rev ignition, new stainless valves, new "harder" valve seats (this combo allowed the XR to rev the moon and not blow up), WB e series exhaust, FMF powerbomb (sounds just like my YZ), bored out carb by 2mm and polished carb Body mods were: A-Loop seat and tank, Revalved suspension for MX by JM racing, eibach springs and race tech gold valves (in both the front and rear suspension) CR front and rear fenders, RM front # plate! etc etc Jetting specs: 168 main, 68 pilot, 2 1/4 turns on pilot screw, needle in stock position, float at stock specs! (They didnt have the mikuni pumper when I did this mod so im sure I could get even more HP from this XR if I installed one) Anyways about the ignition mine lasted about 2 1/2 yrs and then for some reason my bike started running weird...sometimes it would run great down low and sometimes it wouldnt! I spent hours adjusting the carb (float, jetting, etc!) but it didnt help. One day I decided to put the stock ignition and CDI back on, and that was my problem. Something obviously wasnt the working correctly in the ignition and it caused my bike to sputter! I think the WB ignition is a great deal and allows the XR to "run like it should" after putting the stock igniton back on it just wasnt the same, I couldnt lift the front wheel with ease in 4th and 5th gears! Sorry to blabber on but I think as long as you have the "normal" hop up mods such as: new exhaust airbox snorkel removed, new air filter, rejetted, etc and your ignition is becoming the "bottleneck" in your performance...then this mod will be great! It allows you to have the mid range hit and you eliminate the bog at the bottom (very similar to a YZ)! Another <$100 mod which gives you awesome snap is a higher compression piston (I had a 11:1 WB JE piston) you dont have to use race gas and you dont have to bore your cylinder! With these mods I could easily smoke 98-99 YZ400's and it was pretty cool to see everyone at the MX track wondering "is that an XR"? Anyways I hope this helps in your decisions, if you have any questions email me at: [email]motoman393@hotmail.com[/email] Garrett [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
White Bros XR4 Rev Kit
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