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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Whats All This Fuss About Crankshaft Smoking?
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[QUOTE="EricGorr, post: 392839, member: 19611"] Kawie KX125 Most rods are case hardened and shouldn't be polished. Theres so much turbulence in a two-stroke crankcase that polishing won't make any difference. However in four-stroke engines the problem of windage (oil bonding to the crankshaft and rod) can be reduced by polishing and coating certain parts. Teflon is often used to prevent oil from sticking to crankcase walls and crank weights. Regarding the pin welding, sometimes when a crank is rebuilt too many times, the fit and finish of the pin and pin holes wears making it easy for the crank halves to pivot on the pin and throw the crank out of true. Even as little as .005 inch can be noticed in handlebar vibration. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Whats All This Fuss About Crankshaft Smoking?
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