You might want to very carefully inspect the bike-side edge, top & bottom of the pulleys, both front & rear; the teeth on both pulleys, including the shape of the top & the bottom of the hole between teeth; and the teeth on the belt itself, not just the top edge. I've seen a couple of belts start showing similar fraying when one of the pulley's involved had picked up something and damaged the cogs - there wasn't anything caught in the belt &/or the pulley teeth by the time I got to see one of these, but a very close inspection of the pulley cogs/teeth revealed damage in there to the edge of the pulley that was tearing/fraying the belt every time it passed over that section of pulley!!
One of those belts was on an almost new F3, with the damage to belt looking very similar to that in your pic, and the damage to the pulley mostly right down in the bottom of the gap between a couple of teeth on the rear pulley. Something hard had obviously been jammed in there for a short while, but it tore the bottom of that gap between pulley teeth and either going in or coming out, it ripped a sharp edged sliver of metal up with a gouge below it in the raised side of the pulley that's meant to stop the belt riding off the bike-side edge, and THAT was what was doing the damage to the belt, both to the top edge and the bottom edge of the teeth on the belt just like that on yours! They'd brought it to me to do for that one, so I had tools on hand and I used a die grinder to smooth out all the raised metal bits on the pulley; checked that the belt wasn't torn anywhere else; trimmed the 'hairs' off the belt with a sharp pair of snips; and that Spyder is now nearing 200,000 km on that belt with no hassles or issues ever since! :thumbup: (Just like me, he still does thousands of kms a year on dirt & gravel roads too, without any additional or forgotten belt guards and has only had this one belt damaging occurrence!
)
The other one was due to a chunk of quartz being picked up and jammed tightly into the teeth of the front sprocket... It basically cut the belt very nearly in two right down the middle before anyone noticed anything - it was the growing buzzing noise & vibration that gave it away; and it was a right pain prising the chunk of quartz out of the depths between the cogs. This one was half-way across the country in the middle of nowhere, so I only had a small hand-file (or more correctly, a slightly over-sized nailfile on a multi-tool! :banghead: ) to smooth out the jagged bits on the pulley & a multi-tool knife to cut off the longer of the frayed 'hairs' on the belt before letting him ride on. Still, got the job done, and despite dome discussion about replacing it, I believe that belt is still out there driving its Spyder some years and quite a few kms down track (with a spare coiled up inside the frunk lid!) Last time I saw it was a few months ago, and while the belt still looked awful, it was no worse than it had been on the day the damage happened, and it was still doing the job!!
hyea:
There's no denying that they're bloody tough belts! nojoke
One of those belts was on an almost new F3, with the damage to belt looking very similar to that in your pic, and the damage to the pulley mostly right down in the bottom of the gap between a couple of teeth on the rear pulley. Something hard had obviously been jammed in there for a short while, but it tore the bottom of that gap between pulley teeth and either going in or coming out, it ripped a sharp edged sliver of metal up with a gouge below it in the raised side of the pulley that's meant to stop the belt riding off the bike-side edge, and THAT was what was doing the damage to the belt, both to the top edge and the bottom edge of the teeth on the belt just like that on yours! They'd brought it to me to do for that one, so I had tools on hand and I used a die grinder to smooth out all the raised metal bits on the pulley; checked that the belt wasn't torn anywhere else; trimmed the 'hairs' off the belt with a sharp pair of snips; and that Spyder is now nearing 200,000 km on that belt with no hassles or issues ever since! :thumbup: (Just like me, he still does thousands of kms a year on dirt & gravel roads too, without any additional or forgotten belt guards and has only had this one belt damaging occurrence!
)The other one was due to a chunk of quartz being picked up and jammed tightly into the teeth of the front sprocket... It basically cut the belt very nearly in two right down the middle before anyone noticed anything - it was the growing buzzing noise & vibration that gave it away; and it was a right pain prising the chunk of quartz out of the depths between the cogs. This one was half-way across the country in the middle of nowhere, so I only had a small hand-file (or more correctly, a slightly over-sized nailfile on a multi-tool! :banghead: ) to smooth out the jagged bits on the pulley & a multi-tool knife to cut off the longer of the frayed 'hairs' on the belt before letting him ride on. Still, got the job done, and despite dome discussion about replacing it, I believe that belt is still out there driving its Spyder some years and quite a few kms down track (with a spare coiled up inside the frunk lid!) Last time I saw it was a few months ago, and while the belt still looked awful, it was no worse than it had been on the day the damage happened, and it was still doing the job!!
hyea: There's no denying that they're bloody tough belts! nojoke
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