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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: 383139, member: 19611"] CR-Man, Recently I sent Phil a crank for a KX500 that was ridden in the desert at high rpm. The owner complained of the vibration and wondered if anyone balances that crank. Apparently Crank Works has done many such cranks and they enlarged the lightening holes located at the top of the crank. Phil told me that most stock cranks are over-weighted. Meaning that the balance factor is designed for a lower rpm than peak. Perhaps the reasoning is that most off-road riding situations are in an rpm range far below the peak. For example, when I worked at TUF in the early 1990s, we had a 60 year old customer who was an engineer and wanted to change the balance factor of a KX500 for a range of 2,000-4,000 rpm. In that case he added Mallory to the bottom half of the crank halves. Recently I sent Phil a crank for an 02CR250 like yours. The bike will be ridden by Larry Witmer at Loretta Lynn's in the +45 Vet class. In years past we've always built 275cc engines for Larry but the 02CR250 cannot be over-bored, so stroking is the only option to make the bike a bit closer to competitive with 426 and 520s. I'll let you guys know how it works. [/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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