I have a 2009 SUNL 660 (the Rino copy) have 120 miles on it. Just about since I bought it new it hasen't run right. I live at 5000' elevation. When I give it hard throttle it coughs and sputters. Like its starving for fuel. Talked to a couple dealers, they said to rejet it. Tried that, did not help. Took the fuel line off and started the engine, gas pumped out the fuel line about half way. Could the pump be the problem? If so electric or the Mikuni DF62-702? Sometimes after messing with the fule pump and lines it runs great! Makes me think its fuel related.

 

I have aSLGK-650B and it starts well but does sputter when warming up! I have a choke/throttle that I pull out and it fixes the problem. By the way...Would anybody know where I could purchase parts for the machine....brake pads or any type of machine parts for this particular model?? I was told it was a "Sun" model but if/when it needs parts, I am lost!! Have searched the web but no luck!! Ride Safe and Thanks!!