Make sure you check your squish (piston clearance with combustion chamber (squish band)) try 0.025”

This aftermarket kit didn’t have near enough clearance, only 0.010”, should be more like 0.025” and ORM is normally around 0.032”

[@chainsawcanuck]

My neo-tec ns872(ms381) was 0.017" from the factory

[@jimssawsnstuff8903]

It’s a neo-tec, they build them to blow up! Most of them guys that buy them post on their group they blow up in the first 10 minutes, then spend a month fighting to get a replacement 😜😂

[@waynebaumgartner6858]

blow the plug out? wow

[@jimssawsnstuff8903]

Nope, it didn’t blow the spark plug out, I did a decompression delete (plugged that hole) plug was ok, but the old cylinder and piston were sure scuffed up inside