Join Date: Sep 2008
Location: Prescott, AZ
Thanked 1,888 Times in 1,485 Posts
Rep Power: 126
A new needle and seat should have fixed the problem. I would check the needle and seat again for debris/trash. Is there a fuel filter installed between the fuel shut off and the carb. If not, put one in. Did the dealer check the float level? This could cause the problem also, and if float level is too high could be why it's back firing (running rich). Shutting off the fuel petcock when it's parked (and when transporting) should solve the problem also, unless the petcock seals are bad. Check that the petcock is not leaking fuel by removing fuel line at the carb and closing the petcock - no fuel should come out with the petcock shut off. Always shut the petcock off when storing the bike between rides. Fuel leaking into cylinder then into crankcase is a common problem on the 660 when the needle and seat are bad or trash gets caught in the needle/seat. For that reason alone always shut off the fuel when not using the bike.
08 Camo 700EPS, 26" BH OGs on Blk 108's, 1" frnt whl spcrs, Elka Stg 2, RDC 2" lift , Rhino axels, EHS Bullet Box & lid mod w/K&N, Dyna FS, HMF Swamp Exh, Coop45 sheave, greaseless wts, purple spring, Yami US HD frt bumper, Bison Hunter rear bumper, ViperMax 3500 w/syn line, ATVrocks skids & Rock Sliders, Rox risers & Solex tapered quad bars, Roto Pax, PIAA Intense White H4's, Plano 1510 rear box.