V7 II shaft failure

[SmithSwede]

I’m happy for you.   The bike is fixed.  It didn’t cost a ton.  And you learned a lot just fixing it.   I think that actually helps with the bonding process.

I’m still not sure why the teeth on the pinion gear failed.  I was 99% sure a bolt or other part came loose and chewed up the works.   Apparently not.   Hmmm

[killorbytes]

I just had this same exact thing happen to me. On the highway and the bike just dropped out of gear. No power. Thanks so much for posting this. BTW - 2016 V7II with 5200 miles. I've only had it for a year - purchased in 2020 with only 396 miles on it. Good to know the v7ii bevel box fits.

[ohiorider]

Painful to look at your photos of damage.  Hope it all comes back together nicely.

Bob

[Kiwi_Roy]

Yes thanks for the update,
My money is on water leaking in the boot, you can see lots of rust on the shaft, perhaps it ran down the tunnel, entered the rear end taking out the pinion bearings.
With the pinion bearings a little loose there would be excessive stress on the teeth due to sloppy alignment. How loose is the pinion in it's housing?
It could also be just bad assembly in the factory, after all they never bothered to grease it properly.
Use silicone sealant on the boot and find a better strap to replace the Q strap.
I also greased the flange where the rear end bolts on thinking grease would repel water.
Honda used to make a grease specifically for the drive shafts, I haven't seen it lately but that's what I use.
-
Did you say the rear end has been apart before, possibly didn't go back together properly.

[Muzz]

Good to see you are sorted.

Things I have learned on Wild Guzzi (Malik, Smithswede, Sign216 and others)

(1)  Every rear end lube change, make sure the housing vent is not blocked.
       If it's blocked it can pressurize, forcing oil out and suck water in.  (Mine was blocked from new - thanks Joe)

(2)  Every tire change, relube the splines.  Remove the old grease and replace with moly grease.

(3)  Check UJ's for play while you are in there.