The engine had a broken rod I have replace rod , piston and cam shaft. I can not get engine to start because I am getting severe back pressure through the carburetor and oil filler tube. What is causing this problem?
Yep Roxy told you right ...... Head gasket is one culprit, and then the valves on your OHV just might not be spot on.....
There is one other thing that might not be right though........ TIMING is a big issue...... Since you had the engine apart.........
Let us know Mon Ami ~!~!