I too had problems in the beginning. I got my Raptor the last week of September. After the first service I noticed it was bogging. I took it back to the dealer (which they suck). They had my quad for 2 weeks before a Certified Yahmaha Engineer came out to look at it. It ends up, my carbs were machined INCORRECTLY from Yamaha. I had to wait another 10 days to get new carbs. It is fixed now but, I'll tell ya. I went as far as getting info on state specific lemon laws. Yes, I called Yamaha and let them know. They don't care. You are just one in how many million Yamaha product users. All of this SH*T is unfortunate. Hope the people out there with problems get better response than I did.
GOOD LUCK!

 

Whats wrong with the w/b e-series pipe ,besides rejetting the carbs properly? Just ordered the pipe.

 

BOOGIEMAN,

Same here. I had mine do it a few times STOCK...it got to the point that I told my friends NOT to touch the throttle on start up. It helped, but after the Yami dealer replaced them, and supposedly moved the idle-air out a half turn each, it still happened again, but supposedly Yamaha themselves didn't want to replace them again, SO, I talked the dealer into doing a valve adjustment (no cost to me...they were out quite a bit) and I personally moved the airbox forward as tight as it would go, AND snubbed the forward runner clamp bolts a LITTLE tighter than the BS Yamaha dealer spec torque. My 4-year old could've tightened them better. I've done full pipe, jets, and air filter since then...no more problems. A richer idle seems to help.

 

Thanks again all maybe mine will be alright get it back Saturday.


BOOGIEMAN

 

Take it to a Honda dealer, take the hit, and get a 300ex. Then put a 305 kit in it for $500-600 and exchange your pipe for one for the 300ex and you will be in the same position with reliability. Still have the small quad and the reverse. Oh yeah, I forgot, get a 20 tooth front sprocket for the 300ex. THEN it will be the same.

 

The problem with the carbs blowing off is that the intake valves are to tight!
Just adj. all of the valves and your problems are gone I have repaired 13 so far and not a single problem!

 

TRICKRAPTOR,
What Mods and cosmetic changes have you done to your 660. Your name got me curios!