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Honda MX & Off-Road Dirt Bikes
96 CR250 Crankshaft threads
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[QUOTE="Bunya, post: 1194691, member: 77196"] You did lose money. The weight is junk. You can't safely use it. There isn't a whole lot of difference between 1.25 and 1.75. When you retapped it you removed a lot of material. The amount thats left is not strong enough to safely retain the weight. It's not going to be perfectly balanced, especially after retapping it. The dynamic forces that act upon it can be very large, especially at RPM's that match up to resonant frequency of the crank system as a whole. Have you ever seen the film of the Tacoma Narrows Bridge rip itself apart? That's a good example of what happens when something hits a resonant frequency. If you research flywheel weights, some people have had weights trash their engines. It's quite possible that they were a bit out of balance and hit a resonant point one too many times. Under normal circumstances, these forces are well within the limits of the thread, but not after retapping it like you did. Whatever you could have sold it for on Fleabay is what you're out. That would have offset or even paid for whatever the correct weight is going to cost you. See what [i]I'm[/i] saying? Anyway, to solve your problem. Since you tapped the weight I'm assuming you have a M12x1.75 tap. Find a piece of bar stock, probably at least 3/4" and a foot or so long. Drill a hole in the end & tap it to match the crank. If the bend isn't too severe, you can then thread it on the end of the shaft as far as you can and use it to carefully bend the shaft back. As it straigtens, you should be able to thread the bar on further. Always keep it as tight as possible. Go slow and keep checking with the flywheel weight to see how close you are. Don't use the old weight you retapped to check it with!!! Even though threading a bolt into it looks straight does'nt mean it is. If it is crooked, then you'll still have a problem when you put the new weight on. Wait until you have the new weight and use that for checking the bend on the shaft. Even if you don't put a weight on, the shaft should still be straightened for the nut to fit properly or there's a chance it will loosen up and ruin your day. [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
96 CR250 Crankshaft threads
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