Raptor carb question
#1
Raptor carb question
Okay I found another problem with my Raptor. After I start it, it starts back firing through the carbs when I asked the dealer about this they told me they have had over 50 Raptors come in with the same problem and have to put a $30 piece that Yamaha made to fix the problem with the carbs falling out and causing it to do this. I then asked why this isn't covered by the warranty or recall,, they couldn't give me a staight answer... What a rip....
#3
#4
Raptor carb question
ROACH007- i had the same problem with the carb boots on my raptor until i put new carb boots on from WWW.UPPRACING.COM. and they have not given me a problem since.the stock carb boots on the raptor are a poor design to begin with because they bellow out and flex and over time this will weaken them and they will fail.if you go with the boots from upp it will solve your problem and it also is a much better way to secure your carbs to the boots because it is a much stiffer boot which will not lose shape under pressure and come off.the stock boots can seem as if they are secured properly and in fact they may not be which will let an excessive amount of air and make your motor run lean .as you can tell i am impressed with this product and can highly recommend it.your backfiring may be caused from a very lean condition from those boots not being secured properly-just something to keep in mind.
#5
#6
Raptor carb question
Gentlemen,
One posssibility that you haven't explored is that your valves may be out of adjustment. There are no problems with the stock carb boots. If your bike is backfiring, there is a problem in the engine. Raptors, like other water cooled engines, are extremely bad about their valves tightening after break in and when the compression stroke comes around, the intakes are still partially open. This allows the combustion to blow back through the intake and blow the closed carburetor off of the boots. Adjusting your valves to the correct tolerances will eradicate this problem.
~Matt
One posssibility that you haven't explored is that your valves may be out of adjustment. There are no problems with the stock carb boots. If your bike is backfiring, there is a problem in the engine. Raptors, like other water cooled engines, are extremely bad about their valves tightening after break in and when the compression stroke comes around, the intakes are still partially open. This allows the combustion to blow back through the intake and blow the closed carburetor off of the boots. Adjusting your valves to the correct tolerances will eradicate this problem.
~Matt
#7
Raptor carb question
I have had my valves adjusted already and was not caused by this. If you start the Raptor up and watch the boot and carbs they are bouncing back and forth. It never backfired until the carbs got vibrated out of the boots. I talked to the service guy today and he said the new boot and the clamps will keep this from happening. He also showed me a new Raptor sitting on the floor was doing the same thing and they have the parts ordered to replace them..
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10-16-2019 12:11 PM
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