Lee

The crank shaft does on TDC move quit a bit with out the piston moving.So I pulled the cylinder off of piston and checked for play at the crank and can not see any at all.So I pulled rod and piston and checked for play in the rod to piston (wrist pin) and it is tight also.The mag can not be move to change timing just in and out to flywheel to st the 10 thousands clearance which I set with a non magnetic feelers gauge with magnet at mag forks. I can't help thinking it has something to do with the rod and piston not moving at top or bottom of stroke causing the timing to be off.

The key looks good no marks .The gas is only 2 weeks old and is ethanol free. It is getting gas and the seal are tight .Thanks for suggestion.I am really stumped.My oldest son is coming down this week end and wants to take it with him and see what he can do.He said it is now a challenge . He has his own automotive repair garage and is better at trouble shooting then me.

I am really stumped.I have it together and it has good compression as well as blue spark that will jump over 1/2" but will not fire at all. I even tried gas in the exhaust with not even a pop. I pulled plug and it is getting gas. I put plug in Snow blower again to make sure it fires and it does. Put it back in chain saw and nothing.At this point I am considering selling parts on E__Y .

Edit by @factory : email address removed to help prevent spam, it's best to send contact information by personal message (PM).

Dave Thank You for that Info. I will get back to it Monday or so. All of the members here have been so helpful I hope I can some day return the favor.

Thanks Dave it helped a lot and I will save it.

Wow thank You , I put it together tonight and just came in from garage to see what the points get set at and seen you diagram and it appears I got everything together wright. Just need to set points which I currently have set at 14 but have not seen a setting for them yet.I did check for spark and it is getting a nice blue spark.To late to run it because my garage is about 20 feet from a neighbors bedroom that is just across the alley. Ill take you up on the email of the parts list at your convenience. Does it say what the points get set at and the setting for the mag to flywheel clearance.

Installed the piston and rings into the blind bore.No easy task with out the proper ring compressor .Trying to figure out where everything goes and the order in which it must be put together has taken some time.Sure could use a parts diagram although I am getting there.not sure what the presets are for the carb but this would make it a lot easier . May be a while to I get back to it because of honey do lists!

Thanks I will do that. Thanks for the information.

The rings came today and this evening I went to the garage and fitted them to the bore.I need to glaze the cylinder then try to figure out which way the blind bore cylinder fastens to the lower case.Its been about 28 years since I took it apart so It will be interesting putting it back to gather .It is very cold here in PA and my garage takes a while to warm up in this weather.

Thank You.I did get rings and fitted them tonight.

Thanks I just ordered some rings from overseas .5 sets for $11.89 with free shipping.So I have little to lose if wrong size but I measured my piece of ring I found in engine for thickness and measured piston and bore so I think they will fit .May need to grind some to get wright end clearance . I will post results once I get them and install. Thanks

I am new to this site so I hope I am doing this post in the wright place. I have a Lancaster chain saw with a O & R SLA-20 ENGINE. I would like to know the size ring it takes. As near as I can measure it would be about a 1.5mm x 38mm. I only have a piece of the old ring so it is hard to tell the diameter.

I am new to this site so I hope I am doing this post in the wright place. I have a Lancaster chain saw with a O & R SLA-20 ENGINE. I would like to no the size ring it takes. As near as I can measure it would be about a 1.5mm x 38mm. I only have a piece of the old ring so it is hard to tell the diameter.