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Dirt Bike Brands - Other
White Bros XR4 Rev Kit
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[QUOTE="mtngoat, post: 107778, member: 18818"] Spoke to the White Bros tech folks. Apparently, stock XR4 ignition curve is very retarded, especially thru mid-range RPM for EPA compliance. The kit makes the curve linear (flat), which should really improve mid-range response, IMHO. The rev limit is not adjustable. The kit still has not been dyno'd and no apparent plans to do so. The tech had ridden before/after application and claims significant improvement, consistent with Jay Peter's observation. This mod is most popular with the TRX400 quad. No reports of blown motors due to high reving. The tech agreed to send me the owner's manual. If there's any more good info there, I'll post. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
White Bros XR4 Rev Kit
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