We purchased a 04 LT50A last year. I read about removing the restrictions. So I did. I removed the intake plate. Removed the second pilot and punched out the restrictor in the muffler. It ran great for while. Then the banjo bolt on the oil pump came loose one day and fried the rings. I had it bored and put a OEM piston and rings in it. It ran ok but it was running very lean. I started bumping up the main jet size. After a lot of screwing around with it. I have pulled the motor, replaced the seals, had the cylinder and head milled. It now makes 120psi. There's a 90 main jet in it and I still have grey on the plug. I looked at a Polaris and can 50 and there main jet is a 75. How much bigger should I go?