[Michael P. Wole]

Holly claims the blown power valve due to back firing is old school. Just got a 4150/4777 650 dp with mech choke and the dvd that came with it said they fixed that problem back in the 70's. Phoenelic (sp) spacer is the way to go(almost wood).
Sounds like hot fuel to me...what is the float level/fuel pressure when it quits running?
How hot is it getting?