They are supposed to be replacements for the Honda engines, I own a Honda C70 Passport, I know others have swapped the Lifan engines on them and I don't think they needed to change the rear sprocket. I know for a fact that I have 41 chain on my scooter because I was too cheap to buy the "right" metric chain (415 ?). Ran it several years like that on dirt roads and tame paths and such and never had an issue with the chain. Unfortunately, I have not ridden it in over 15 years. :hammer:
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