anyone have any problems with their yfz sputtering out as you put any kind of load on the throttle?

my mechanic thought it was bad gas at first, but the same thing happened again. We are thinking it could be electrical. Just wondering if anyone else had had this problem. Oh, BTW spark plug was very white when I changed it out.

Thanks,
Jeff

 

It sounds like you are running lean. What jetting are you currently at and what elevation do you ride at.

 

Try running it with the headlights on

 

yes thats true running with headlights on helps it

 

that gets rid of sputtering?
i think not...

more than likely a jettng issue... if its lean... you will find it popping alot... mine sputters now because its getting warmer and i havent gone back to my summer jetting yet.

 

Yeah, pops alot. I have been running 100 octane with stock jetting. Think if I adjust the jetting that should take care of the problem?

Thanks

 

goto www.yfz tech.com or /www.yfz central.com

 

Try putting in a 45 pilot and a 160-165 main and adjust from there. The YFZ runs lean from the factory. What other mods have you done?

 

i have a 2004 and had the same problems. all u need to do is drive with your lights on

 

dont listen to this yahoo he doesnt know what hes talking about. i took mine to a yamaha dealer and the did everything they could think of and on day i was in a atv forum and someone suggested to drive with the lights on and i havent had any problems since.yamaha made it so running with your lights on keeps the electrical system charged thats why when your fan kicks on it doesnt drain your battery.