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Originally Posted by mr. softie
If you have been running rich that could cause backfire on shut down.
Try scrubbing your chain with wd40 and a nylon brush, followed with rags. If it is an O ring chain the links are probably ok even if it looks rusty on the outside surface.
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If it ONLY backfires on shutdown AND your gas mileage is good (60-70), I don't think I'd worry about it much. Might be able to stop it just by changing your shutdown habit a bit.
Just exactly what makes you think you need a new chain ?? A little external rust probably means nothing. Tires and chains are two things you should not get cheap with.