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warped malossi piston - why?
Posted: Mon Oct 14, 2013 11:15 am
by markauk
working on a pal's PX125 with a 166 Malossi
what would cause the piston to warp like this? its exhaust side damage
Re: warped malossi piston - why?
Posted: Mon Oct 14, 2013 11:37 am
by goldeneye
alreet mark, hows it going? that looks a canny one! whats that stuck on the exhaust side of the piston? looks like something has been sucked in, or a ring has spun, snagged in the exhaust port, and forced the piston crown up. its been running hot as well by the looks of it.
Re: warped malossi piston - why?
Posted: Mon Oct 14, 2013 1:25 pm
by Jack221
At least there is no sign of pinking
That certainly is a bad one. Barrel ok?
In the first picture before the crown was cleaned it looks like its running really very lean. The plug must have been grey.
Re: warped malossi piston - why?
Posted: Mon Oct 14, 2013 1:52 pm
by Adam_Winstone
Has the exhaust port been tuned, with a wider port?
Re: warped malossi piston - why?
Posted: Mon Oct 14, 2013 4:02 pm
by Polossi220
Similar to one I just had revolver down pipe had cracked destroyed /melted exhaust side of piston
Re: warped malossi piston - why?
Posted: Mon Oct 14, 2013 7:28 pm
by T5-190
Very nasty, got a picture of the cylinder ???
Re: warped malossi piston - why?
Posted: Tue Oct 15, 2013 3:35 pm
by wack 63
Was the exhaust blocked causing the port shaped stain?
Re: warped malossi piston - why?
Posted: Wed Oct 16, 2013 9:58 am
by markauk
the exhaust wasn't on very tightly at the barrel, would air intake cause this?
Re: warped malossi piston - why?
Posted: Fri Oct 18, 2013 6:41 am
by Jack221
If it was running weak anyway then, yes! A loose exhaust will make it run even weaker
