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Yamaha MX & Off-Road Dirt Bikes
Re-jetting a YZF250 with Slip-on??
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[QUOTE="blakemx124, post: 62127, member: 21855"] Rockchuker, We have the R-4 same as you have. I know that this exhaust got bagged on by alot of mags but I am quite happy w/ the pipe. Rich, I know that you are quite knowledgeable. What would be your "ballpark" guess as to how much of a horsepower gain is had with an aftermarket exhaust such as the White Bros R-4? I understand that all the pipe builders are trying to sell their product and possibly exagerate power claims. When I spoke to John Anderson @ White Bros he told me that their dyno is used by MXA and Dirt Bike Mag and that it was considered accurate. The chart enclosed with the pipe was from what I understood to be the same chart (or facsimile) of the dyno readings. You're absolutely right that I can't prove the horsepower claims, and I know that I set myself up for your comment, so I ask you, what would you suggest a person to do when picking a pipe for say, a 250F when you knowingly can't try each pipe and have to rely on looking at a bunch of phony dynocharts put out by the various pipe makers to pick the best one? ------------------ [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Re-jetting a YZF250 with Slip-on??
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