372 xt

[peak performance]

Numbers after taking 0.020" off the cylinder.
Squish before 0.046" after 0.026"
Before 99/117/75 after 101/119/77

 

[Sloughfoot]

Bet that gives it more gusto. You doing anything else to it?

 

[quattro.pilot]

wow i wouldn't have guessed the factory squish to be so loose

 

[Sloughfoot]

wow i wouldn't have guessed the factory squish to be so loose

40s was common in that era. Often more than that on saws from the 70s and 80s. I don't believe there are very many saws today that come factory in the low 20s.

 

[peak performance]

Bet that gives it more gusto. You doing anything else to it?

I'll raise the exhaust a hair to 99 again and rough up the intake and I think that might be it. Blowdown will be raised a bit doing that. I shed a few grams of the piston as well to lighten it up.

 

[peak performance]

wow i wouldn't have guessed the factory squish to be so loose

That was a new hyway cylinder and pop up piston I was surprised it wasn't a bit tighter

 

[Stump Shot]

That was a new hyway cylinder and pop up piston I was surprised it wasn't a bit tighter

Hyway is known for plating peeling issues when ported. Best to just port out the exhaust port and leave it untouched at the cylinders edge.