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Standard Rings

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I need a set of rings for a standard bore '74 TY250. The rings are obselete at Yamaha. Anybody know of a part number for some rings that will work and are available?

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Actually, it was the bottom ring that broke Bob. I went on and called B&J to check and decided to just get a fresh top end. I'm shipping off the jug tomorrow for a new bore and piston. Thanks for taking the time to check for me though. I guess it's still winter in Canada. Been over 60 degrees the last two days here. Actually had the a/c on Sunday but it's just not right running the a/c in February. Stay warm up there.

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