Worn front sprocket

[SaferRides]

I normally ride with earplugs to preserve what is left of my hearing. Recently I took the R1 for a ride to dry everything after giving it a good wash, and without earplugs noticed that there was a fair amount of chain noise. The chain and sprockets have done nearly 50,000 km - the chain has been adjusted 4 or 5 times and the rear aluminium sprocket is only slightly worn.

Anyway, I realised that I had not taken off the front sprocket cover since replacing the chain and sprockets and decided maybe I should have a look. Ignoring the disgusting mess under the cover, the drive side of the teeth look quite worn and the sprocket really should be replaced. This is a first for me - I have never worn out a front sprocket while the chain is still in good condition. In fact, I've never had a chain last that long before - it looks fine and there are no tight spots. It is an EK 3D which I bought locally for a good price.

The front sprocket is OE and the rubber dampers are still in good condition.

[F5 Dave]

On dirtbike I'd often replace the worn front sprocket mid life of chain. 50k is great going on a litrebike I'd say. Maybe time for a cheap JT and see out next 8k perhaps?

[SaferRides]

On dirtbike I'd often replace the worn front sprocket mid life of chain. 50k is great going on a litrebike I'd say. Maybe time for a cheap JT and see out next 8k perhaps?

Not a JT! I tried dropping a tooth on the front sprocket when I replaced the chain and fitted a JT. I did a few thousand km, then decided to fit a larger rear sprocket instead. The JT had visible wear, so I've avoided them since.

I'll see what another OE sprocket costs.

Sent from my SM-S938B using Tapatalk

[F5 Dave]

Strange I've had good success with them. But it doesn't have to last longer than the chains last summer. The front wears fastest of any part so never reuse.