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Xr 4 throttle respone ?'s
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[QUOTE="lipskid, post: 167317, member: 21801"] No it won't, but correct jetting will work much better.:confused: When the bike is being ridden at a good clip, say, wide open in 4rth, and he chops the throttle, does it backfire? This would be one indication of the pilot jet being to lean. You said he lowered the needle on position. Why? If the bike runs better at half choke, I would say the first order of buisiness would be to return it to the stock position.(please keep in mind I'm no authority on any of this, just puttin' in my .02) Also, have you adjusted the pilot screw? Turn the pilot screw clockwise untill it seats LIGHTLY. Then turn it out(counter clockwise) 2 1/4 turns. Warm up the engine to operating temp. Then adjust the screw in or out to obtain the highest rpm. Reset rpm with the idle stop screw. Also, the stock countershaft sprocket is 15 tooth. Going to a 14 tooth is a fairly significant change(equal to about 3 teeth larger on the rear). XR400's have a lot of low end torque, lower gearing (which is what the 14 has accomplished) will only put MORE power to the ground FASTER. Remember to only make one change at a time. If you do several at once, you never know which one is working(or not working). The stock carb on newer xr4's work really well. I ride mine from 4500' elevation in Moab, to 13,000' in Colorado without changing the jetting. Gotta love this bike! Good luck! Steve [/QUOTE]
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Dirt Bike Brands - Other
Xr 4 throttle respone ?'s
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