it was never about deviating from what the manufacturer recomends. was only trying to get people to look beyond the end of their nose. IMO the internet and most websites in general have done a great injustice to less knowledgable people. urban legend says a bigger piston always needs more clearance and forged piston always needs more clearance. yes, maybe, sometimes. got 2 bikes in the garage with pistons well over 90mm that require less than .0025 of skirt clearance per the manufacturers specs. also have smaller pistons that require above .003. how could the much larger piston get by with less clearance. i think the answer is simple. the composition of the piston, its design and the bore material, operating conditions factor in here as well. after using aluminum bores with nikisil i wouldnt have it any other way. frankly i feel like puking when i see a iron lined cylinder
