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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
01-02 YZ250F crank, rod and rebuild
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[QUOTE="Rich Rohrich, post: 696113, member: 16241"] Frank - The replacement rods & bearings from Yamaha have not been a problem in a properly rebuilt crankshaft. It's important to carefully check the machined journal that mates with the main bearings on the ends of the crank . Once these journals wear the crank can't be rebuilt. The only option is to purchase a complete crank assembly. If you are going to run a used 250F at sustained high speeds like you'll see in SuperMoto it would be wise to figure in the cost of a complete bottom end rebuild as well as servicing the cylinder head. The titanium valves are only good for a couple of seasons before they start to pit and cup. The seats can be serviced by a good machine shop but the valves are unfortunately disposable. It's a great engine/bike package, but they need to be maintained on a schedule similar to a 125 two-stroke. Good Luck. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
01-02 YZ250F crank, rod and rebuild
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