If the rocker arm weren’t so sloppy on the M19, I think it would run a lot nicer. The rest of the engine is built to a high degree of precision, but that rocker arm is something else.
I also have one where the governor balls were hitting the cylinder. The cam on the governor balls needs to be redesigned so they do not fly out as far. There is no need for them to be almost straight out.
I also bought a pair of them and the first one I got lost compression seconds after I started it the first time and has never run right since. It is also very hard to start. I’m pretty disappointed with that one to say the least. The other one I have runs as good as it can with that sloppy rocker arm.
Hi Mike, I checked videos of the engine Jin copied which is Bob Shores Silver Angel design modified.
Apparently one thing Jin did not modify was the way the balls go near straight out all the way.
All of them I could find on youtube are quite similar in that respect.
The governor arms are flying straight out nearly parallel to the ground.
I would agree a slight redesign would be helpful.
I think I would also like to see a clearly stepped latch-out as opposed to the present one which has a gradual slope meaning the exhaust valve eases shut when it is more desirable to have it fully open until it is due for a power stroke.
Gil