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Ol' Ron · 02-21-2016, 02:29 PM

I take .040" off the head, this is usually too much, and like B&S. look for 45-5- thou clearance. another trick is to flaten out the exit of the transfer area to 45 degs or so. Yes, most of us don't have CNC machines. I often wondered how much power gains are made this way. However closing up the piston clearance does improve throttle responsr amd econmy.

02-21-2016, 02:29 PM	#5
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: Combustion chamber reshaping I take .040" off the head, this is usually too much, and like B&S. look for 45-5- thou clearance. another trick is to flaten out the exit of the transfer area to 45 degs or so. Yes, most of us don't have CNC machines. I often wondered how much power gains are made this way. However closing up the piston clearance does improve throttle responsr amd econmy.