It's been a while since I posted. Still working on the 245 that I burned up about two years ago... I have a new cylinder and rings, cleaned up the piston and am ready to put her back together. Before I do, I was hoping to get a couple questions answered before I make another dumb mistake.
With that said: Two questions for you Poulan experts....
1. Does anyone know the ring gap on a 245A? I had new rings made, and need to file the gap myself.
2. Is there enough room to remove the base gasket on this old saw and bolt the jug straight to the crank case? If no, what thickness gasket do I need? I'll make my own rather than trying to find NOS.
Thanks in advance!
I will answer your base gasket question.
In the top of the cylinder at the outer most edge is an area called the squish band. It is the area that is closet to the top of the piston when it comes up on compression. The squish band is intended to force the gases toward the middle of the cylinder where the spark plug sits.
So now what you have to do, is to put the cylinder on, with the piston without a base gasket.
Remove the spark plug and put a piece of solder in the spark plug hole so that it touches the cylinder wall. Have the solder facing in the same direction as the wristpin so that it gets maximum compression. Now rotate the cylinder by hand with the flywheel until you compress the solder all the way. I actually rock it back and forth to make sure I flatten the solder out good. Then remove the solder and measure the flattened out spot with a set of dial calipers.
The measurement you get will tell you what the squish is for the saw. In your case I would not go less than .020" of an inch and in fact I usually go for .020 to .025 on alot of my saws. If you have more than that with the base gasket removed your good to go.
Remember you must use a sealant on the cylinder base like, yamabond or something similiar. Do not use RTV.
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