I picked up a used chainsaw engine the other day that just refuses to start. It has no labels or casting marks that I can see other than 2.1 stamped on the cylinder but I was told that it "may" be a craftsman. The owner couldn't remember. It has a very nice spark. Fuel is drawn into the carb and I can smell gas in the exhaust port so it is moving through. WHen I spin it it starts to "puff" and then a shot of smoke comes out if the carb. There is a hissing sound coming from the carb as well and I can actually see a fine mist of fuel spray out of the carb when it is spun fast enough.

This engine has the carb mounted to a plastic plate that is bolted to the crankcase rather than the cylinder and I don't think there is anything keeping the crankcase presurized. It seems like any air\fuel charge is just getting blown back out the carb on the down stroke.

I don't see any reed valve or even any indication that one is missing. Does this make any sense? Did any makers even use reed valves in their chainsaws? I am quite sure it's 33cc, hense the 2.1 (cu inch maybe?). The oil and fuel tanks are integral into the crankcase if that helps. No removable tanks on this model.

Any ideas on this? Silly me I spent all my time cleanig it and mounting it and what not before I even tried to see if it ran. I'd hate to find out that I wated all this time.

Thanks.

Enjoymentboy