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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Biggest factor of fuel/oil that affects jetting
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[QUOTE="jaguar, post: 1470992, member: 19340"] No matter how you slice it the final viscosity is much more which would require larger jets. That's easy to do with the main jet but not easy with the needle jet. If you know the viscosity of the recommended oil then try to stay close to that with any other oil you want to try. If getting the needle jetting right is near impossible then see what your oils 40C viscosity is and if its low then find an oil with higher viscosity, and if its high then find an oil with lower viscosity. That may solve your jetting problem. Consider this: Amsoil [URL='https://thumpertalk.com/link/click/1437/']Dominator[/URL] has a 40C viscosity of 36, and [URL='https://thumpertalk.com/link/click/1903/']Motul[/URL] 800 Off Road has a 40C viscosity of 120. Huge difference. Today I'm going to do a flow rate test using different fuel/oil mixes to see how close reality is to the calculations. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Biggest factor of fuel/oil that affects jetting
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