Hi,
i just brought a second-hand rossi pixy 3-port (orange head). It's only got one silver shim on it. I ran it on 30% and it's detonating (i can see the half the piston is darker and wear on one side of the piston)
But when i run it on 16% it feels very weak, what should i do? Do i need to add or remove shims? Also, when i run it too lean it, the engine rev still stays hi when i let go of throttle and then slows down after 2 or so seconds....
any help is appreciated