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Yamaha MX & Off-Road Dirt Bikes
Help needed with my IT400
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[QUOTE="cujet, post: 1403090, member: 19501"] Ahh, very good. The IT's had very mild exhaust port tuning. If you want a bit more top end, (and you have a stock cylinder), you can raise the exhaust port 2 to 3mm and widen it 5mm (at the top only if you want good piston support). The transfer port timing is enough. What ever you do, don't go over 193 degrees exh port duration. In any case, glad to hear you have it running well. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Help needed with my IT400
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