Chainsaw Repair

But is the combustion chamber pent roof offset in the 7900?


If so, it would require some fancy offset machining for the pop up?

The offset popup is not an problem. They are no harder to make than a standard popup.

When you add a D shape to an offset the milling machine comes into play, but it still is just a simple task.

if your using the stock piston then becarefull on the port timing , really watch your transfer porting as to high the motor lays down in the cut but if the guy can run the saw and cutting smaller wood then you can get away with the higher transfers , so go after compression

I'll be tearing it down in the next few days to clean it up real well. If the piston has any wear to speak of I'll try to get a 272 piston.

I just did a 064BB with a 395 piston and it has a butt load of torque but not as much unloaded rpm as I used to seeing on an 1122 series Stihl.

I'll be going back in it another time or two.