YP400 Majesty 2006, 40K miles : Have just had a reputable shop replace rear tire and V-belt, and all was fine for ~ 100 miles. A few days ago spent 30 minutes in hot traffic jam creeping along, stopped to re-fuel, and then found that I had lost significant power (~ 45 MPH full throttle, very slow acceleration). I pumped out the fuel tank and refueled with know good fuel. No unusual noise or resistance. Spark plug, oil and filters are all looking fine. Engine starts great. I understand the it might be a fuel pump filter clog, but not sure where to access that. Any suggestions?