What happened here?

[norwegian]

This is how my drivebelt looked after a several km hard run on the river.
Clutch set up: Hc with approx 4,6 gram in heel, and 3.3 gram in tip.
47/42 helix and green spring at 70 degrees.
Felt the clutch, inner sheave wasn't very hot, I could hold my hand to it several seconds, while the outer, moving sheave was "stone cold".
I don't understand what could have happened here? It slipped maybe? Or maybe just a bad belt?
Clutches should be aligned.
As you can see, the top layer peeled off.

 

[blue missile]

was it a yammi belt

 

[norwegian]

Yes. 8dn

 

[MrSled]

Old belt will do that...

 

[norwegian]

Thanks.
More possibillities?

 

[jr_amsoil]

probably just worn out

 

[norwegian]

Thanks for the replies, keep them coming

 

[98srx6]

Probably just old and worn out. I have seen that happen with a clutch that was setup with too much secondary twist...however, the belt was old and worn out on that sled too...

 

[shortstop20]

^^^^^^^
How so? Does it eat away at the belt because the secondary is wrapped too tight, not allowing the clutches to shift out(upshift)?

 

[norwegian]

Mine wasn't wrapped too tight when it happend, but I had driven with the secondary very tight before, I think it was the same belt.