"Puzzels me as it puzzels You
"Puzzels me as it puzzels You Joe.
Normally a dry plug indicates it is working, he did not say if it was any color on it, or still as new compared to the other one.
Wet plug normally indicates fuel, but unconplete/lean combustion.
If the cylinder is dry as well, I fear some serious dammage after all the testing. It was mentioned that the head was to be dismantled, was it?
Then comes the blow back symptom. I have no parts available and no engine, just the parts pcs from BRP. If the leaf valves are sealing properly, the blow back must come from somewhere else. On the part pic of the intake manifold at the leaf plate next to pos marker '3' there is a hole indicated that is not for a screw. I think to remember that some plates have a small fiber valve/screen installed. Might that be missing here?
A hole in the cranck case without visible leakage sounds odd, even a leaking cranck shaft seal. It would normally create some oil/fuel leakage traces.
What happends if some fuel-oil mix or fogging oil is squirted into the carb throat when running? any changes?
lots of questions but no direct answers.
"