I had to put a smaller flywheel/bearing plate on it to make it fit and use a s/g instead of the stock starter. I notched the frame on this before and it did not work out very well (bent the frame) so I had to straighten it back out and reinforced it with some 1/4" angle. The engine will turn over a little bit then hit a wall then turn a little bit more, continuously. Pull the spark plug and it turns over great. With the spark plug in, it's very hard to turn it over by hand so I'm assuming it's the ACR. I lapped the valves and adjusted them before I put the engine in my cub
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