This is a very nice looking engine and displays very well it does run nicely HOWEVER it doesn’t appear like it was actually designed to run for long in any practical sense my point being the crankshaft bearings are the engine case itself and no crank seals are present, the engine side covers have no gaskets installed, the valve lifters are brass on a steel cam with no real way to lube itself. If you add oil to the crankcase it very quickly throws it out of the aforementioned places and then no splash lubrication of the camshaft. I used RTV and sealed the left side cover and then made a paper gasket for the right cover so it could be removed when needed I’ve ended up using a light grease and oil mixture to fill the crankcase with it seems to stay in place better and it lubes the camshaft lobes better than just oil. I sanded and polished the machined surface of the flywheel and took a little bit off of the governor spring to slow it down a little bit Jen is a wonderful designer I just wish he had actually built this engine to be used instead of just looking at it