Dealer #1. Set the idle speed up but it may still backfire and blow them off again.

Dealer #2. Boots are too tight.

Dealer #3. Put on automotive type clamps.

Dealer #4. Yamaha will replace the boots, even if it is out of warranty, but it will take at least 3 weeks, so see if you can find another dealer that can do it.

 

At least your dealers are helping you. Two of my friends own 2000 raptors and they are both blowing the right carb off and their dealers claim yamaha hasn't heard of any other instances.

 

Hmm didnt know they made Raptors in 2000??

Mac

 

Hmm didnt know they made Raptors in 2000??

Mac

 

they did make raptors in 2000 thats when i bought mine but there sold as 2001.......

 

There are screws on the bottom of the carbs, crank em out a turn or so. Turn the idle up a bit, and the problem is gone. I blew mine off one time, called the service dept and this is the info I pryed out of him. good luck

 

Supposedly 27.5 pilots cure the problem... I have some, just no time to rip my quad apart and put them in..

I think I'm also going to put some better clamps on...

I'm more worried about second gear than I am the carbs..

Brad

 

I FOUND A SOLUTION AND IT WORKS...YOU DONT HAVE TO TURN UP THE IDLE...I DISCOVERED IT AFTER I TALKED TO MY DEALERSHIP...YAMAHA IS SENDING ME NEW BOOTS, CLAMPS AND ORINGS...HERE IS THE SOLUTION...THE BOOTS HAVE A NOTCH WHERE THE CLAMPS SIT IN...YOU WILL NOTICE THAT THE NOTCH ON THE BOOT IS WIDER THAN THE CLAMP ITSELF...LOOSEN THE CLAMP UP...SIDE THE CLAMP TOWARDS THE CARB AS FAR AS IT WILL POSSIBLE GO...TAKE THE DAMN SPACES OUT THE CLAMP ASSEMBLE AND THEN TIGHTEN THE CLAMPS A LITTLE MORE THAN YOU COULD WITH THE SPACERS IN...IT WORKED FOR ME...I STILL HAVE MY IDLE LOW...YAMAHA DOES KNOW ABOUT THIS PROBLEM AND ARE TRYING TO FIX IT...AS FOR ALL THE RAPTORS OUT THERE....MY SOLUTION WORKS...IT'S A SIMPLE FIX...THANKS TO MY MECHANICAL ENGINEERING DEGREE...I THOUGHT ABOUT IT..AND FOUND THE SOLUTION...IT'S A SIMPLE DESIGN ERROR ON YAMAHA PART AND THE FACT THAT THE RAPTOR RUNS LEAN....SO IF YA HAVE ANY QUESTIONS PLEASE CONTACT ME...HERBDONSCALA@HOTMAIL.COM ...HERBDON OUT...

 

Tell me about ,
I argued with a fellow rider, fellow Honda rider for that case, that raptor were only made as 2001. He thinks that there are year 2000 and 2001 Raptors.

 

A friend of mine is a tech at a yamaha dealer and he has found one thing for sure that causes the carbs to blow off. When you put the seat on the bike you have to make sure that the plastic guide on the bottom of the seat does not pinch the rubber breather hose that attaches to both carbs then "horseshoes" up right below the tank mount.
He has seen at least two bikes that this was the cause so far.
mine has not done it since the addition of a full pipe,jetting and bumping up the idle a bit.

mike
01raptor
00 gsxr 750