what would cause the piston to warp like this? its exhaust side damage
warped malossi piston - why?
working on a pal's PX125 with a 166 Malossi
what would cause the piston to warp like this? its exhaust side damage
what would cause the piston to warp like this? its exhaust side damage
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.
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Jack221
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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.
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.
Vespa est ieiunas, quia semper operaturi
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Adam_Winstone
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Has the exhaust port been tuned, with a wider port?
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Polossi220
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Similar to one I just had revolver down pipe had cracked destroyed /melted exhaust side of piston
Very nasty, got a picture of the cylinder ???
the exhaust wasn't on very tightly at the barrel, would air intake cause this?