This is a cracker of an engine. Pulls like crazy and goes like missile out of muzzle. Do not use 20W40. Use 10 W 30 and see how it pulls and revs. It revs like a 4 valve engine and short stroke engine. And since recommended is that don't use thicker oil. Will damage bearings and crank and rockers.
Mine crossed 1 lac kilometers but still flies like a falcon.




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