Hello I have a Honda 50 with a gpx160 engine. The engine started in a pitster pro x4 (where it ran fine). I moved from southern Washington to Northern Washington and went to put it in my 50 and it is running poorly. I adjusted the valves and changed plugs, messed with the air mixture screw. It has a mikuni vm26 with a big bore pitster pro exhaust. Does Anyone have a 160 wiring diagram, maybe I wired it up wrong or am using the wrong wiring harness? Could a slight elevation change make it run poorly? I'll try to post a video.