I am having some problems with my 750 speed demon. It is pouring black smoke out the exhaust. The fuel pressure is 6 psi. The float level is fine on primary and secondary sides. I just put new needle and seats in and still blowing black smoke. The fuel is pouring from the boosters. If the float was sticking wouldn't the fuel level rise in the bowl? It stays at the lowest level on the sight plug. Help!

 

I just went out there a minute ago and found the problem. It turns out that when I went rebuilt the carburetor I put in a gasket that was the wrong one. The gasket has an opening for the power valve and right above that it has a hole for the squirter fuel to come through. Turns out that the gasket I was using had a big opening above the power valve and wasn't sealing the fuel off to the squirter passage. What a relief that I found the problem. Now it is white smoking and if a punch the
throttle it pops through the carb. That probably means that it's really lean now right? I'm thinking of switching pump cams to a more aggressive one. Any other suggestions?

 

Yes lean..try the blue pump cam on the second hole if you haven't already.

 

I will try the blue pump cam tomorrow. Does anybody have a color list from mild to aggressive? Thanks