Flywheel change.

[Gordon T]

After being in for a service, I was informed that the ring gear was shot. Presumably from an incorrectly installed (possibly loose) or very worn bendix on the starter motor. A replacement flywheel was sourced and a new bendix acquired. With a Friday afternoon to spare, I set forth on removing the flywheel and repairing the starter. So, starter removed and less than 30 mins later it was repaired.
Just gets the bike tied down and a call out beckons. Blast. Anyhoo 1hr later back at it. From tiedown to flywheel off in my hand, 2hrs 10 mins. Not too bad I thought as Ive never done one before. Heres a couple of pictures of the offending items.

<a href="http://s579.photobucket.com/user/notcurleyboy/media/IMG_0914_zps3aul2xxy.jpg.html" target="_blank"><img src="http://i579.photobucket.com/albums/ss233/notcurleyboy/IMG_0914_zps3aul2xxy.jpg" border="0" alt=" photo IMG_0914_zps3aul2xxy.jpg"/></a>

<a href="http://s579.photobucket.com/user/notcurleyboy/media/IMG_0915_zps6lkk3yeh.jpg.html" target="_blank"><img src="http://i579.photobucket.com/albums/ss233/notcurleyboy/IMG_0915_zps6lkk3yeh.jpg" border="0" alt=" photo IMG_0915_zps6lkk3yeh.jpg"/></a>

<a href="http://s579.photobucket.com/user/notcurleyboy/media/IMG_0934_zpsy67hyt8p.jpg.html" target="_blank"><img src="http://i579.photobucket.com/albums/ss233/notcurleyboy/IMG_0934_zpsy67hyt8p.jpg" border="0" alt=" photo IMG_0934_zpsy67hyt8p.jpg"/></a>

<a href="http://s579.photobucket.com/user/notcurleyboy/media/IMG_0936_zps64aianly.jpg.html" target="_blank"><img src="http://i579.photobucket.com/albums/ss233/notcurleyboy/IMG_0936_zps64aianly.jpg" border="0" alt=" photo IMG_0936_zps64aianly.jpg"/></a>

Now, flywheel/clutch bolts. They were not at all tight. I thought with them being stretch bolts they would be swines to loosen. Not so. I doubt if they have been undone before as the bike has only 12k on it. One handed operation with a 17mm socket and all 5 were loose! Same for the 6 clutch torx screws.
New ones from Motorworks have been ordered up and the old ones will be replaced. For the sake of £19 for 11 bolts, its a no brainer.

 

[Myke Rocks]

Looking at the ring gear:

I suspect you do not have a starter in the bike, but a milling cutter.
It seems likely that there is a fault in the solenoid, and the starter is turning at full power whilst it engages.
Myke

 

[fizzer]

yip i must admit if it were me i would change the starter ,not just the bendix ,just in case .

 

[Gordon T]

yip i must admit if it were me i would change the starter ,not just the bendix ,just in case .

The starter is fairly new. Other than the damaged bendix there is no other wear on it. I suppose with the teeth on the flywheel being worn, I think the last owner replaced it in the hope it would cure the problem. Obviously this didnt work, hence the flywheel needing replacing. At £14 for the bendix, this is a cheap fix. Just putting it all back together this afternoon.

 

[(RIP) Bin Ridin]

The reason for those wrecked teeth has to be found or you might get real good at changing the flywheel....

 

[Gordon T]

The reason for those wrecked teeth has to be found or you might get real good at changing the flywheel....

Already thought of that and to be quite honest, I cant find anything wrong with the starter or why it went like that in the first place. I have a sneaky feeling the original worked itself loose and chewed the flywheel up. It starts as it should now but to make sure, I swapped my starter over onto a mates 1150. It started up just the same , with the same noise etc. Just hope it stays that way.

 

[fizzer]

well done ,great job ,that would have been a fortune in a deeler

 

[Bendy toy]

The engine will always stop on one of two crank positions. Therefore the first bite of the street is shared between just two ring gear teeth. When one gets damaged the teeth downstream will quickly follow.
The Japanese starter system with roller ramps running in oil is a nicer idea.

 

[(RIP) Bin Ridin]

In fairness it is not normal at all to see a ring gear in that condition, so something unusual happened. Even if the starter stayed engaged, it should not do that. Maybe as you say something worked loose, but the person in charge needs a hearing test if he did not notice something amiss...