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Properly installed ( and that's not likely with most ) the fibre gears will last for years. Steel Volvo gears are the best for sure.
I don't advise placing a new fibre gear on a used crank gear. I have often swapped in good used, matched sets, over the years. The gears wear in to each other over time.
The fibre gear must be restrained with a counterhold in two of the three holes in its front face, and NOT held with the crank gear during torquing. They'll blow up quickly if that is done.
If you are looking for a matched, used set, I've got some.
www.sucarburetors.com
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