Gosh, Henry, you tried just about everything. But lets do a bit of trouble
shooting:
- wet plugs are not firing.
- sooty plugs are being fed rich fuel.
- open the air box and see if there is fuel coming into the filter.
- No power, your running on one plug.
- a knock in the engine, could be a lot of things, even a bad rear motor
mount. Question, how is the vibration? How are the bolts holding things on?
is the heat exchanger rattling.
- you mentioned you set the valves, what did you set them to? and what was
the torque on the rocker bolt? Did you set them with the engine cold or hot?
and, did you check them after tightening the bolt?
Henry, I would go to the carb and take it apart, clean it good, opening
everything and pay close attention to the needle valve, it could have some
gum around the point that came loose after you started driving it and
attached itself to the needle valve.
And the wet plug, put a meter on it and see what it says. I have had new
plugs with the insulator cracked. (you never know who dropped it at sparkys
auto parts)
Maybe some one else in the group has some suggestions. Miles? Mike? Jim?
Bill