I would check the valve lash also before checking the timing. Seems they were set the same as the O.S. and Magnum engines. 0.002" loose and 0.004" tight on both valves


I aquired one a couple years back and it had a broken lug. I stumbled across a crank case on Ebay and rebuilt it. It is a good running little engine. I worried about not having a muffler, but without one, it wasn't any louder than my O.S. 52 four stroke.

Setting the timing looked a bit intimidating until I found the tip on using a pushrod throught the hole the intake lifter goes in. It drops into a hole in the cam locking it in place for TDC. Try very hard not to damage the gasket under the cam housing. I managed not to, but the new case was machined a couple thousands lower and if I tried to tighten the cam housing down, it locked the gears up. I cut a new gasket from a coke can and that solved that problem. Turns out I had to do the same for the back plate.

Humm, I need to put that engine on my Fun Star and save the power from the O.S. 52 for something bigger.

Don

Keep us posted.