Originally Posted by culliganman
Ready to pull my hair out!
Bike is running very lean, happened all of a sudden have had the carb apart 3x to no avail, boots look good you could eat off the carb its so clean. What are the odds the timing chain jumped? I do notice a air blast,poof type sound when starting it that seems new if that makes a difference not a backfire its coming from the motor somewhere.
One of my 350s did this. I too looked for the usual suspects without success. Eventuality I completely disassembled the carb (TM33). It turned out there was a bit of trash accumulated ABOVE the float needle seat restricting fuel.flow.