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Message: [QUOTE="DEANSFASTWAY, post: 766730, member: 31309"] Bclapham : How about if a the piston is at TDC and the exhaust port floor is open a bit under the Exhaust skirt on the piston. I know a guy that stroked a big bore RS 125 and had that trouble because the cyl was overported by his knucklehead buddy with a dremel,the thing runs real fine up top though .I was thinking of reversion or dilution of crankase mix at low speeds possibly but with The Revs up I guess Extraction would keep things negligible or woukld it cause a slight draft under the piston. Its a microsprint on alky 58mm bore . Hes actually not doing any better than with the CR motors that he had running 58mm piston. I would think you wouldnt want any area under the exh skirt , why would anyone hog out the bottom of the exhaust port floor so low anyway , wasting $$$.This was a fresh 58mm RS cyl . [/QUOTE]