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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Spark Plugs Keep Fouling...
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[QUOTE="Uchytil, post: 1416676, member: 43803"] Honda specifies a pump octane(owners manual) of 92 for my 01 CR125R while Yamaha specifies 95 RON (shop service manual) for my 1997 YZ125. Since both engines are stock form (more or less) they get pump premium which averages (like Rich stated) 90 pump octane. I would get that and jet for the conditions (temperature, humidity, and altitude). Pretty basic stuff, and, for me, I switched to a dual stage fiberglass reed system for the CR (EB type). [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Spark Plugs Keep Fouling...
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