Me and a buddy have done everything to get this bike to go and we’ve just about had it with the thing. Ran fine for about two months slowly got harder and harder to start. Did a shim job, changed piston and rings. Got it together still had problems with it bogging down on acceleration. Changed out seals in carburetor mid body cleaned the whole carb out and changed the accelerator pump diaphragm. Bike still bogs down really bad rarely runs fine. Anybody have any ideas? Maybe not getting enough air??