[Lamekurt]

I have heard that the tiniest bit of belt burn can cause a misfire. I honestly don’t even recall slipping the belt at all but I’m guessing that’s what happened here (note the little inner edges on a few of the teeth)... everything on my machine is stock and never had misfire issues before and I have changed the belt once already (that time was totally my fault).

 

[sandblster]

What you are looking for a a spot on the belt that is thinner than the rest of the belt. Called a flat spot. Hard to tell by picture, but do not see that, but pictures are deceiving. I see only normal wear.

 

[Lamekurt]

What you are looking for a a spot on the belt that is thinner than the rest of the belt. Called a flat spot. Hard to tell by picture, but do not see that, but pictures are deceiving. I see only normal wear.

The spot right behind my thumbnail, would that be considered a flat spot?

 

[sandblster]

Problem with picture, no depth of field. Would need a picture showing down the length of belt, not pointing down at belt. If you can see or feel a flat spot then it is a problem. Belts cheap. Destroyed clutches not so cheap.

 

[dafish]

Maybe tell us more about how you've heard one little spot causes a misfire?

I can see a tiny amount of swirl on maybe 5 of the teeth.

Have you considered putting your spare, the one you never leave without, on it to see?

 

[1 Polaris]

I'm trying to understand how a drive belt can cause an engine to mis-fire.

 

[Goshe]

It will throw a misfire code, you may or may not feel it.

 

[Mrhp]

The pcm is looking for an acceleration rate on the crankshaft. It knows when the cylinder fires, and that is an acceleration, then after that is a deceleration. The pcm can see the difference. With a worn belt, I would assume it confuses the belt slip and grab as a misfire. That’s how it works in theory. In practice, all bets are off. I am surprised they have not revised their sensitivity algorithm to avoid this phantom code.

 

[Reno80109]

I normally see a flat spot on the cord along with the teeth. I don’t see any scrub marks on the cord.

 

[rsarffs]

Most likely fuel pump issues.

 

[RZRdavid]

I have heard that the tiniest bit of belt burn can cause a misfire. I honestly don’t even recall slipping the belt at all but I’m guessing that’s what happened here (note the little inner edges on a few of the teeth)... everything on my machine is stock and never had misfire issues before and I have changed the belt once already (that time was totally my fault). View attachment 670607

Replace it and use it as a spare. Hard to tell good/bad belts from a picture.
It could cause a misfire if it is bad enough to cause slip.
Put on a new belt and drive in low for a bit, should clear the code...if it is the belt.
Remember, it takes about 30 miles to break-in the new belt, so first ride with new belt will be less than 100% throttle for a good portion.