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Old 08-06-2015, 12:10 AM
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Davezilla Davezilla is offline
Motorized Bicycle Elite Member
Join Date: Mar 2014
Location: San Antonio Texas
Posts: 2,710
Default Re: How to know when broken in? Fuel ratios?

Most these engines are poorly balanced and will shake themselves... and the rider to death... I usually buy bottom ends with balanced cranks and upgraded bearings which helps a lot. sells really nice balanced bottom ends and engines and I've ran these at 10,000+ rpm with no serious vibration issues... some of the ebay specials I've used tho are a totally different story and shook like crazy at just moderate rpms.
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