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Post by tsa on Jan 26, 2021 20:32:41 GMT 1
Hi All I need some help fast. I need someone to measure a std Autisa 170cc piston for me please. The measurement Im looking for it from the top of the gudgeon pin hole to where the dome meets the edge in mm if anyone can help.
TIA
Kenny
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Post by simon998 on Jan 29, 2021 11:10:12 GMT 1
I havent a stock Autisa piston but ive an autisa barrel here.
It's had 5mm shaved off the bottom and when I fit it over a standard RD 125 LC bottom end (non YPVS, 105mm crank not the 110mm YPVS crank and 56mm piston) the piston is flush with the top of the barrel at TDC. I'm not sure if the Autisa pistons were 5mm taller to compensate for the 5mm taken off the bottom of my barrel.
I was speaking to a guy that tunes quads, mainly blasters and he said I need more space at the top so he's fitting a 1mm plate and two base gaskets to it, as at present the piston will hit the head (It's o-ringed with no headgasket). He tried a 67mm Blaster piston in it, it fitted perfectly and it cleared all the ports at TDC and BDC but was still flush with the top of the barrel without the plate/base gaskets.
IDK if the above hellps you but with a little math you might be able to suss it out.
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