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Old 01-11-2019, 10:36 AM
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My opinion, it may be easier to get the 12 tooth. If that differential has a similar bolt pattern for the sprocket as the Peerless 100, those type are not the easiest to get a hold of. Not to say you couldn't make one fit by drilling new bolt holes in that pattern.

However with the new information about the engine being 11hp and ungoverned, your top speed with the 12 tooth is 50mph. Assuming a 5200 when the valves start to float (valve springs not strong enough to return them fast enough).
In the age of information, ignorance is a choice.