To adjust the float level you need only remove the float bowl, the cup shaped part on the bottom of the carburetor. The very small brass hinge like piece that the float pushes against is what needs to be bent, and only a very little bit. It will not require heat to bend. If, as I suspect, you're talking about the intake manifold instead of the float, if it is cast aluminum as some of them are, you cannot apply heat to it to bend, it will melt, and it won't bend but will break. If you're trying to level the carburetor and the manifold is steel you might be able to bend it but doubtful. How far off level is the carb? They will run just fine at a slight angle and do not need to be perfectly level. When riding at wide open throttle take note of the fuel line and watch to see if it remains full of fuel. If it does then the problem might be the float level. If it shows large air pockets, bubbles, then you're looking at a fuel flow problem from the tank. What spark plug gap are you running? Shoot for .024 to .028 for the best gap. Good luck, keep us posted on results.
Tom