The motor is a pk 80. Ok so I really need to get this fixed due to this being my only source of transportation. Problem I'm having is motor runs fine at idle and low rpm but as soon as I give it a lot of throttle it just kind of stays at the same speed and seems like it's being limited. I put a new cdi and magneto coil in last week and everything ran great. It doesn't even seem like it wants to go faster. I've tried 3 ngk b6hs plugs. I've moved the clip one notch in either direction. I drilled holes in the baffle and I made sure the air filter was clean but still no change, almost seems to be getting slower top speed. I double checked my electrical connections. Im about 3 1/2 full tanks of gas through the motor now. Do you think it's time to change my oil/gas mixture? I'm stumped someone please help