lost sprocket

So i was riding home from work today when this happend



The big nut somehow came off. followed by the rear sporcket and carrier. causing damage to the thread on the axle.

anyone seen anything like this before?

 

thats what i thought. 87000km (about 54000 miles) on the clock and i would gess that nuts never been touched.

 

NICE!!!!

About 6 months / 10,000km

That's off a 800. are they the same as the 750?

EDIT: yep, 1995 forth gen.

 

Wow..........that is ugly......like tink said it can be worse. Hope you can get her fix and get back on the road. Cheers mate

 

Thats WACK! Got a 46MM socket from Triumph for their Speed-Triples...

Nice view of the swing arm after it was powder-coated!

I had the counter sprocket on my EX just kinda slide off the shaft. There were two 8mm bolts that just got lost. I do remember using an electric impact wrench when I was working on it. Now, they are saftey wired together. Maybe you should consider wiring them after properly torqueing em?

 

Yeh and that 46mm nut is staked so WTF?

 

I'd bet that some maintenance work happened in there before you got the bike (cush drive rubbers, for example), and the nut wasn't proppaly brought up to factory torque spec or staked correctly.

Examine your chain carefully cuz it coudda got chewed up.

 

Chain and sprockets were about due to be changed anyway. figger i may as well do the bearings too. last VFR i had needed them done around 100,000km.

 

I actually had the exact same thing happen to me. I talked to a few mechanics, one of whom owns a 4th gen, and nobody had ever heard of this problem. I ended up replacing all the cush drive rubbers and all the switches(neutral, clutch, kickstand) as the chain managed to screw more than a few up.

At first I thought somebody had loosened the nut the night before but I remember it being staked on my pre-ride check as I checked the chain. I just rebuilt the final drive with new seals and I managed to lose a bunch of stuff when the sprocket fell off. Did you notice any shifting trouble before the incident? I got a lot of false neutrals in the week before everything fell apart.

 

Now you mention it, i have had a few false neutrals lately, also had a feeling like the clutch was slipping under heavy acceleration. but maybe i imagined that.

Just checked my switches, they all seem ok. the chain did take a chunk out of the swing arm tho, and also tore the chain gaurd around one of the bolts that holds it on.

I managed to find all the rubber cush things but couldn't find the main nut.

 

So you say you replaced some parts, put it back together, and it fell apart?

 

This is what I get for drinking and going on the internet.

In this order:
pre-incident symptoms: false neutrals and two moments where it felt like the transmission slipped into neutral by itself and slipped upon getting back into gear.

Then the 3rd moment where it felt like the transmission slipped into neutral and I look down to see my sprocket missing and my chain just flopping around my rear axle. I end up finding my sprocket but nothing else so I replaced all the missing pieces. Still wouldn't start and found that my clutch and kickstand switch managed to fail/break in the process.

As noted in my thread: http://vfrworld.com/forums/3rd-4th-generation-1990-1997/36897-new-vfr-owner.html
I replaced a few washers, dust seals, and cush drive rubbers. Everything is tip top now although I need a new chain soon. No more false neutrals too. I'll never really figure out how the axle nut managed to loosen...

 

so went to a bike wreckers today and he just happened to have a compleat swingarm stashed in the attic. $250 for all the bits i needed