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Dirt Bike Mods & Maintenance
Where to get a crank stroked?
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[QUOTE="EricGorr, post: 711189, member: 19611"] Although I offer the service through my business, I only assemble the cranks and rely on TNR Machine in Dowling Michigan to do the machine work. I've tried and evaluated all the companies offering the service of boring, bushing, welding, and finishing the big end bore and TNR's work is consistent and the service is relatively fast. TNR doesn't offer all of the other services as Crank Works or Falicon, but quite frankly on a 125 you don't need it. Most Japanese 125 cranks are over-weighted anyways and most of the balancing services are just a guess at the proper change in balance factors. I've built about 25 engine with bore and stroke combinations including high revving small bores and they're all running fine. So the whole balancing thing is a bit of a black art. Some companies add weight to the bottom of the flyweights, some remove it from the top. I don't do either and I haven't had anything fly apart or produce excessive vibration. The KX125 can be stroked a safe maximum of 2mm off-set for a 4mm total stroke change. The cases must be bored to accomodate the connecting rod swing. Don't be tempted to grind the rod for clearance like some west coast companies. That will weaken the rod and cause it to break prematurely. One last thing about Crank Works, I've recommended them in the past and I think that the owner Phil knows more than anybody in the business of crankshafts, but those guys have some serious organizational and order-fulfillment issues to focus on. I never got a crank returned in less that 8 weeks from them, whereas TNR is about 2 weeks turnaround. TNR Machine, 2050 W. Dowling Rd, Dowling, MI. 49050 Tel(269) 623-2827(Tom Watson) [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Where to get a crank stroked?
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