O.S. 91HZ Rebuild Guide Part 1

Checking that my motor is getting proper wear durring breakin. Only 11 flights on these parts, and just a flight over 1.5 gallons. Sorry for the end of part one, had a little delay with the piston ring.

[@FrankyDooki]

you skipped the most hard part: put the piston in the ring. This is what I want to know how to.

[@Arcticiceac]

The big bump on my motor was to the rear and the smaller square on my engine. O s. 91 h

[@Nuno_Tomas]

If you change the piston on your motor you need to put some oil to lubricate the spares? Nice vid man...