Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
When did it last run? You have good spark with plug removed and grounded while cranking? Do you have good compression? Check by holding finger with rag over the spark plug hole while cranking. If it has spark and compression, put a teaspoon of fuel into the spark plug hole, and re-install the spark plug to see if it will start for a few seconds.
Service manual link above!
When did it last run? It has compression , but all the valves moving if you remove the rocker cover and check?
Valves may not be opening.
Did you move the crankshaft or camshaft that would have displaced the internal timing?
If not, I would check the crankshaft to flywheel key.
Does it crank easily with spark plug removed?
Then it is out of time.
Has to be either the internal timing or the flywheel key.
Only way is to go back into the engine and recheck!
I assume the battery voltage is good and the cables and starter are good!
If it were hard to turn with spark plug out, the pulley on the lower crankshaft could be binding the crankshaft, but you say it turns ok. Starting fluid should have at least let it try to run.
That tells me you have a valve open when the spark occurs, which has to be valves or timing.
Just loosen the pulley.
OK, so it still has issues with timing. To loosen the lower pulley you need to add shim between pulley and crankshaft, to give it more clearance.
If you have no clearance on the pulleys, they take away all the crankshaft thrust and make shaft hard to turn. If you have crankshaft thrust, it is not a problem.
You are going to need it off to go back into the engine.???
yes, I don't expect to finish this today!