Re: sticking valves?

Posted by Fish'n Jim On 2018/2/12 22:33:48

You can pull the cover off the side and expose the valve train and see if they are working or not/where you adjust.
The intake would have to be partly plugged, if not getting fuel mix, if that's operating Ok. Mice make strange stoppers. A bore scope or fish a wire may lead to clues. I use a blow gun with a plastic tubing in place of the nozzle and fish it in places and see what comes out. Compression test is another easy option. (Don't ask me how I had acorn shells in #8 and the plug was in.) I always check for that stuff before I fire up. Prevents damage. Too much emphasis on getting them running "right away", but not right way to go...
I don't recommend you mystery oil down through your carb. Add to gas or the crank case, but what are you doing it for if it's a mystery and you don't know what's wrong? Do you really need it or just because every else does it?
If they're firing but not burning, the exhaust manifold won't get as hot there, so an exhaust thermal scan would provide clues. Those are pretty cheap at the chinese takeout now. All this could have been prevented with a systems approach.
I bet it's something else.