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Gearing question. At least a 17 tooth front sprocket, OR a 45 rear. Most of us run both, stock chain is still ok. I personally don't trust the stock chains and they rarely last long. I would do a New chains with the new sprockets.
It is not a good idea to idle an air cooled bike for an hour unless it is very cold outside. From a cold start, no more than 15 to 20 minutes. If already warmed up, no more than 10, 5 if it is hot outside.
Also, do you know if the carburetor is stock or not? Lean jetting can cause a soft seizure by overheating the piston.
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