A little mechanical excitement

[Cormanus]

Soo.....he replaced the chain and then this happened? That means that all of this repair is on him?

No. Someone else replaced the chain just under 2 years and 43,000 kms ago. I doubt I could land it on him.

Yikes! That's a serious looking hole in the sprocket cover.

Would it be safe to assume that these are not the original sprockets? My guess would be that whomever installed that countershaft sprocket the last time possibly did not torque it to spec.

With that sprocket and chain wobbling back and forth on the countershaft, I'm surprised that you weren't able to feel or hear it when metal rubbed metal.

What a bummer, Cormanus! Hopefully this will not cost you too much financial pain. Since you were already going to replace the chain and sprockets, it looks like the only extra parts you'll need are the cover, bolt, washer and screws.

It is.

Yikes! That's a serious looking hole in the sprocket cover.

Would it be safe to assume that these are not the original sprockets? My guess would be that whomever installed that countershaft sprocket the last time possibly did not torque it to spec.

With that sprocket and chain wobbling back and forth on the countershaft, I'm surprised that you weren't able to feel or hear it when metal rubbed metal.

What a bummer, Cormanus! Hopefully this will not cost you too much financial pain. Since you were already going to replace the chain and sprockets, it looks like the only extra parts you'll need are the cover, bolt, washer and screws.

They are the third set of sprockets on the bike. I guess not torquing it to spec is a possibility.

Yikes! That's a serious looking hole in the sprocket cover.

Would it be safe to assume that these are not the original sprockets? My guess would be that whomever installed that countershaft sprocket the last time possibly did not torque it to spec.

With that sprocket and chain wobbling back and forth on the countershaft, I'm surprised that you weren't able to feel or hear it when metal rubbed metal.

What a bummer, Cormanus! Hopefully this will not cost you too much financial pain. Since you were already going to replace the chain and sprockets, it looks like the only extra parts you'll need are the cover, bolt, washer and screws.

Yes, me too. I've had trouble with the chain for a while. I think it may have had a tight spot and, if it wasn't really well lubed, it would lunk a bit as I took off. I think the bolt has only dropped out recently. I have a vague recollection of hearing a knock, like I'd flicked up a slightly larger than usual stone. As nothing else seemed to happen, I thought little more about it. Fortunately, I don't think there's much room for the sprocket to move on the countershaft as the cover sits pretty close in. I should though have heard some metal on metal. Better get a hearing test as well.

Yikes! That's a serious looking hole in the sprocket cover.

Would it be safe to assume that these are not the original sprockets? My guess would be that whomever installed that countershaft sprocket the last time possibly did not torque it to spec.

With that sprocket and chain wobbling back and forth on the countershaft, I'm surprised that you weren't able to feel or hear it when metal rubbed metal.

What a bummer, Cormanus! Hopefully this will not cost you too much financial pain. Since you were already going to replace the chain and sprockets, it looks like the only extra parts you'll need are the cover, bolt, washer and screws.

Fortunately its not too bad. The bolt and washer are reasonable; the cover is a shade north of AU$200 which seems a little rich to me. I suppose I'll have to replace it so there's something to catch the next bolt.