Bought a crash damaged 1125 a couple of weeks ago,bit of engine damage,altenator cover scraped and gear shift shaft snapped off!

No worries have the spares,motor fired up ok,but could feel/hear a rubbing noise around altenator area.As cover was badly battered thought it might be rubbing on rotor?

On strip down inside of case was fine,not touching rotor,but the balance gear just above the crank looked a little blue??? Definitely not right,rotor off and I found a horror show!!!

both the crank gear and the balance weight gear are "burnt" and badly worn, no signs of lube failure on anything else in the area.

these pics compare the damaged gears on the left with a fresh set from another motor.




My first thought was that one of the gears hadn't been hardened properly,but a quick brush with a file shows they are both soft now.The cam chain gear is glass hard still.

Any thoughts? bike has 4k miles.

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Nige...1125d 9.43@140mph

Behind the rotor? Induction softening it is, then ...

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"It is often said that before you die your life passes before your eyes. It is in fact true. It's called living."
Terry Pratchett

Hi battyone,

I have seen this once before, I think it was a case of no case hardening , the bike, a 1125R 09, came in with a rattle at tick over. Seemed to come from the alternator side. On strip down, I found exactly what you have there. If you haven't already, check the gauze strainer in the bottom, found quite a bit of shrapnel down there. The bike has been fine since the repair work was done, a year or two ago.

Regards, Jon

Thanks Jon,that was what I was hoping,someone had seen it before.Lack of hardening was the only real explanation.

Oil was good, nothing in the strainer. Sounds lovely with the new gears fitted.Probably did it early on and all the rubbish went with the first oil change.

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Nige...1125d 9.43@140mph