Put a 22.5 pilot in and it’s running super lean like it’s got an air leak I sprayed carb cleaner around the manifold, carb and boot can’t say I noticed a leak, cleaned the carb (brass tubes, air vents, jets) previous owner had it running with a zip tie on the choke plunger when it was stock ages ago since I put the 170 in and new jets I took the zip tie off and runs super lean again, turned the air screw all the way in no difference, only runs well with choke partially open