Seized Drive Sprocket

kahnowerh · #1 11-17-2009, 02:24 AM

I could already feel the wind in my hair when...
Well, the chain jumped from the sprocket and got caught in the spokes.
I exclaimed things, fixed that problem (as far as I can tell) and was gifted with another.

It seems as though the drive sprocket is seized.
I could roll the bike (both with clutch in and clutch out) before my mishap.
Now the back tire's locked, regardless of clutch position.
I checked the clutch and everything looks okay.

I attempted to uncover the drive sprocket, but it seems some superhuman chinaman attached the thing, and I stripped the screw. (“—Also, Dude, ‘Chinaman’ is not the preferred nomenclature. Asian American, please.”)

So, maybe the question's a bit premature (as I can't get into where the sprocket is—yet), but I'm wondering if anyone has had the same problem or has any insight.

The weird thing, to me, is that it worked before the accident but now it doesn't.
And I'm not sure it's related to the chain jumping (but maybe when it seized the chain jumped? that doesn't make much sense to me)

Any help would be appreciated.

I've got a Dax F80.
It went together pretty smoothly for my first build...
But I think I'm going to replace all the butter-consistency bolts

azbill · #2 11-17-2009, 08:38 AM

sounds like the chain jumped off the drive sprocket
take the clutch cover off and check

kahnowerh · #3 11-17-2009, 09:24 AM

Ha... The advice I didn't want to hear last night.
I'm working on the patience thing...
Zen and the Art of Motorcycle Maintenance.

I'll let everyone know what's up after I get a bolt extractor some time late afternoon.

Until then, we can take bets...

I thought the chain had more slack previously, so I'm thinking maybe a sticky link got wedged in the small clearance area up there.

Venice Motor Bikes · #4 11-17-2009, 11:08 AM

Quote:

Originally Posted by azbill

sounds like the chain jumped off the drive sprocket
take the clutch cover off and check

I concur!! (It's a easy fix!)

247Jude · #5 11-17-2009, 12:33 PM

I had a simular incident when my chain was too loose, it folded under the sproket cover and wedged there, try rolling it backwards with force it may pull the chain loose, and save you a little time.

kahnowerh · #6 11-17-2009, 04:13 PM

Yep, I tried rolling it back and forth, with some force (increasing with my blood pressure).

I'm off to buy a new toy (bolt extractor) and I'll let ya'll know.

Thanks for the help.

247Jude · #7 11-17-2009, 04:50 PM

Not back and forth, just back with as much force as that when it locked. The chain is train reacked under the cover and wedged between the sproket and the cover bolt housing. ( More than likely anyhow). Ackually better to take the cover off and pry it free.

Kevlarr · #8 11-17-2009, 04:52 PM

Quote:

Originally Posted by kahnowerh

(“—Also, Dude, ‘Chinaman’ is not the preferred nomenclature. Asian American, please.”)

The motors are made in China by (from every video I've seen) men so Asian American would NOT be the proper nomenclature.

kahnowerh · #9 11-17-2009, 09:54 PM

Quote:

Originally Posted by Kevlarr

The motors are made in China by (from every video I've seen) men so Asian American would NOT be the proper nomenclature.

I had watched The Big Lebowski. If you're not familiar, I'd suggest you partake.
And, for some reason, Idiocracy gets better for me every time. I don't think that's supposed to happen.

Anyway, you are exactly correct, Jude.

(Sorry for the quality, cell phone.)

Anywho, my chain was far too long, I fiddled with it...
Ended up in the back streets deciding to shorten it. Told myself it was a bad idea to take off the master link only lit by streetlights (decent lighting, but not for small black-colored things).
I did it anyway. You know how that ends up.

I had to macgyver my way to a shorter chain. Luckily I had (almost) all of my tools and a poorly fitting chain-breaker (a parktools). I rigged it up to work, did some pounding, some finessing...
And now my chain actually stays on!

I'm loving my MB!
Just rode to school to pull a graphic design all-nighter...
But at least I didn't have to pedal (much).

Nashville Kat · #10 11-18-2009, 07:46 PM

If you have any more trouble with getting the screws off- like the sprocket cover-

although they are phillips head screws, a medium flathead screwdriver will fit on them- so get a good medium sized Craftsman flathead scrwedriver (or a whole set!) with the SQUARE SHANK- designed to get a crescent wrench on, and you can turn the screwdriver with the leverage of a wrench as well.

That chinaman will probably have not gone that far...