Originally Posted by hotboy454
How is the power valves causing it to run rich and making the spark plugs black? Also you can smell the gas coming through. Is the a indication of it running rich and needing to be netted to or just power valves and adjusting the idel mixture screws. Also the description for the cam said Cai idile with lope can't hardly tell. Elgin1015p cam. Or crane 274 h06.
When the the power valve is acted upon by manifold vacum it stays shut and no additional feul inrichment complemnts the jetted curcit.
A backfire if severe enough effectively blows the small diaphrame in the power valve, now fuel is drawen through the holed diaphram into the engine.
you can see the raw feul in the power valve cavety when you take the carb apart, this area is normally dry.