Does it vibrate more too? That sounds like 4-stroking, which means you're running too rich.Ozzimo wrote:ok, I'm now fairly sad. I thought I had fixed my "bogging" problem with the seafoam and carb clean. But alas i still am bogging (aka dropping in speed accompanied by a deeper sound from the engine, almost like a fart or a raspberry) as I reach about 20 MPH. Is this a throttle problem? It did this before I removed the carb by the way...
Check your needle valve position relative to the carb slide. What's your main jet size? Your idle screw's close, should be 1 7/8 turns out. Could also be the exhaust port is plugged, as mentioned.