Log Man
ArboristSite Member
I have a new MS390 cylinder and 2 new pistons. I checked each piston in the cylinder and this is the results.
Piston 1 -----------------------Piston 2
Exh 160*----------------------Exh 162*
TR 110*-----------------------TR 106*
Int 155*-----------------------Int 156*
BD 25*------------------------BD 28*
Squish 0.042------------------Squish 0.043
Which piston would you use and why?
What port work would you recommend?
What port size to muffler opening?
I will be doing a Muffler Mod.
Thanks for your input.