Have you pressure tested your carbs? I melted a piston because my carb back plate on the front cylinder was leaking. It ended up sucking air and leaning out the mixture on that hole. Pressure up your carbs like you would to test pop off, but don't go all the way to make the needle pop. If the gauge needle doesn't stay still, you're leaking somewhere. Find the leak with soapy water and correct it.
Jetmaniac just messaged me to do this. Fingers crossed thats it. The carbs have been sitting for a long time in a junkyard shed. Very possible i didnt clean them good enough.
Don’t retard the timing just yet. I just turned the high speed adjuster (on the rear carb) out an additional 1/8 or 1/4 (can’t remember) and the piston wash is near perfect.
This is so important and something slot of people miss I think. Your carbs should hold until they pop. And the pop should be extremely crisp. And should immediately seal. It's especially critical on high hp, high displacement engines that see a very big increase in fuel requirement from idle to wot, at the rapid transition freestyle requires.
Wow... How did you fix it? What did you put on the gaskets to get that to seal up correctly? Ive been told to use grease.
Disassemble and use a thin coat of Three Bond 1211 on both sides of the gaskets. You can also use Moto Seal or something similar.
