this is my first time ever working on a 4 stroke I've rebuilt plenty of 2 strokes but ya this seems to be more difficult then I thought but I got this topend from ebay and thought the rop the piston was cracked but it wasn't but now I can't figure out the timing and torque specs for the head but I'm trying so if anyone has any suggestions or tips on how they rebuilt these that would be greatly appreciated comment what might help. well hit that like and subscribe button. Thanks, u and i well post more videos hopefully of this getting fixed and running