helllo
I been having a problem with my 2007 yamaha raptor 350
It was working great and it suddenly die. It started right up without a problem but when I hit the gas it won’t rev up. I cleaned the carb and didn’t do anything I rebuild the carb and it was still the same so I went and brought a new carb and it worked fine but just for a few minutes. I disassemble the new carb and it was clean. Prior to all this I cleaned the gas tank.
when I try to rev up a combination of gas/oil comes out to the filter. I really don’t know what to do
Here is what I have done so far:
new carb
New spark plug
Oil level was very low so I change it
Cleaned the gas tank
My quad doesn’t have the rev limiter
New cdi box
New filter

 

Hey man

I actually have a 2007 Raptor 350 too. I have had a ton of different problems with it so far. I have spent about $1,000 on fixing it and I'm a carful driver, I think this is a bad model.

Anyways, I have two suggestions for you to check out/try on your quad. First, this probably won't be it, but you should check your gas on/off switch. The switch could be torn. I it is, this could cause many problems, and let extra stuff into the carburetor. My second guess would be one of the air valves on the top of the carburetor. I actually had a problem where my quad wouldn't run for more than a minute and it was just because the air valve on the top of the carburetor wasn't sealed properly.

Hope I was able to help, good luck.

 

I think this is one of the people that post once and leave

 

My bad, i did forget that I posted on this forum. I just let the atv sit in my garage all summer, I was tired of it.
But i finally found the solution: to my surprise the camshaft was missing a bearing, and the timing was off. I had to take the engine apart and find all the pieces of the bearing, luckily I was able to find them all and there was no damage.
Hope this help anyone who’s having the same problem or at least you know something else to check if your having this problem