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Yamaha MX & Off-Road Dirt Bikes
YZ250F aftermarket exhaust, decisions?!
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[QUOTE="xchecker, post: 62095, member: 20877"] Yo Zcookie49, Jeff has been working on getting the max HP out of the pipe and he as done a great job with that. He had it on a dino a week or two ago and on the bottom where the stock one was making 8 hp his was making 12 (huge difference) and he had a 4 to 4 ½ hp gain on top. This thing hits a lot harder coming out of the corners like a 250 2-stroke and it revs much quicker. He uses an insert in the head pipe (It removable so you can put different sizes in) to get the bottom end punch. I’ve tried it with out the insert and there isn’t much bottom end. I know he is working on several other variations of pipes, but I don’t know if he’s added spark arrester to the list. He’s been building cool 4-stroks for a long time. Back in 88 he stuffed a TT600 motor in a ATK chassis for me. A bit heavy but one of the trickest bikes for the time. Until the YZ250F came out he was stuffing XR200 and DR200 motors into CR125 chassis. He’s quite the 4-stroke nut. Almost as bad as Pete at Powroll. ------------------ [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
YZ250F aftermarket exhaust, decisions?!
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