...low.? I think it has a problem with the rotary valve not sure how it works on this engine looked at parts diagram can't find the valve looks like it might be part of the crank. What should I look for?
I know this is a shit answer... But you have to give more info.! Could be a lot of things. Like compression, fuel mixture, ect. Please be more persice. I hope what little I have gave you helps. Give more and I might be able to help more.