Still seeking help on old poulan chain saw

[wilburn cox]

Like I said earlier, you either have excess fluid hydro-locking the piston, or something has changed the ratio in some way, like excess carbon, different stroke or different piston, or closer fit of the cylinder to crankcase that would change the ratio. there were many models that were real close to this one, maybe you have a slightly different crank/piston, etc...

Check out those threads I sent you in the p.m., there are some serious poulan nuts there that could probably help, they love those old Poulans.

Thanks again Fish. There are no fluids in the saw at this time, has been dry for several days. No carbon anywhere. Piston & cylinder were replaced with a used set ordered from "Chain Sawyr". Piston and cylinder were a match for the original from the saw. Motoman answered earlier today and said some of the old saws had transfer ports cast in the crankcase and they might be blocked. I have no idea what transfer ports are. Are they tiny holes such as carb. passages?? I will check this out as I have some more time.
I appreciate the 2 forums you mentioned and I did register for the "SawHawgz.com. I have not yet posted my situation on their forum but will shortly.

Appreciate all of your suggestions.

 

[Jrleddy]

When you took the exhaust off could you see inside the cylinder?

 

[wilburn cox]

When you took the exhaust off could you see inside the cylinder?

Thanks JrLeddy; Yes I could see inside the cylinder and it was clean and not scored. Piston (portion I could see) was clean.

Red Cox

 

[motoman]

Wilburn, I am certainly not an expert on 2 strokes and did talk partial trash about piston skirts. It's the piston crown which acts like the intake and exhaust valve. I have been on line and will offer the following that might help.

Compression is surprisingly high if a you tube is to be believed 190 PSI on a rebuild. Yikes.

My own Husky has a compression release which I use. It really makes a difference in starting. The web is full of examples of compression releases. If yours is too old to have one it may be you are feeling "normal" compression ? During a portion of the stroke both the cylinder head and the crankcase are under compression.

Transfer ports are part of the two stroke engine. In the really old days that's all there was. Reed valves are widely used now and sit in the intake runner back of the carb. But they apparently would not give your symptom.

Fish has apparently suggested some online refs. I will add "indianmcinfo.com" and "pilotfriend.com" for excellent cutaways and animation of the 2 stroke operation. Might help.

There is a forum member who said he was the "two-stroke dude" in his shop (my words) We need to get his attention.


Edit: I reread your post about "no exhaust felt." Stay with that clue. If you look at the animations you will see the engine has to breathe.

 

[wilburn cox]

Wilburn, I am certainly not an expert on 2 strokes and did talk partial trash about piston skirts. It's the piston crown which acts like the intake and exhaust valve. I have been on line and will offer the following that might help.

Compression is surprisingly high if a you tube is to be believed 190 PSI on a rebuild. Yikes.

My own Husky has a compression release which I use. It really makes a difference in starting. The web is full of examples of compression releases. If yours is too old to have one it may be you are feeling "normal" compression ? During a portion of the stroke both the cylinder head and the crankcase are under compression.

Transfer ports are part of the two stroke engine. In the really old days that's all there was. Reed valves are widely used now and sit in the intake runner back of the carb. But they apparently would not give your symptom.

Fish has apparently suggested some online refs. I will add "indianmcinfo.com" and "pilotfriend.com" for excellent cutaways and animation of the 2 stroke operation. Might help.

There is a forum member who said he was the "two-stroke dude" in his shop (my words) We need to get his attention.


Edit: I reread your post about "no exhaust felt." Stay with that clue. If you look at the animations you will see the engine has to breathe.

Thanks motoman.. I think it was you who suggested I check out the forums on sawhawgz.com.. I registered for their forum but have not ads yet posted my situation on it