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Rear sprocket removal
#798324 02/14/20 9:30 pm
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I know i must b missin something but i got the sprocket loose but cant get it off hub / brake assy. Service manual says...if teeth are worn...replace...very helpful. What am i missing...btw..1969 Thunderbolt QD.
Thanks in advance
Bill


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Re: Rear sprocket removal
Bill Long #798327 02/14/20 10:19 pm
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Should slide off, something is distorted or burred.

Re: Rear sprocket removal
Bill Long #798331 02/14/20 10:54 pm
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It's loose, flopping around, not tight just won't come OVER the drum. Do you have to separate the drum and brake plate to remove sprocket? Seems like waay too much trouble. My Bonneville was a breeze compared to this.


Dream as if you will live forever , live as if you will die tomorrow.
Re: Rear sprocket removal
Bill Long #798333 02/14/20 11:59 pm
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The alloy brake plate needs to be off for the sprocket to come off the wheel.

Gordo


The roadside repairs make for the best post ride stories.
Re: Rear sprocket removal
Bill Long #798335 02/15/20 12:25 am
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Ok, so the ''left side axle'' needs to be disassembled? to expose the shoes to remove the sprocket? Wow/// that seems like a ridiculous amount of work / trouble to just R n R the sprocket. But, i have no choice. I guess that's why i have ridden American and Jap bikes mostly since 1968.

Thank you very much, i appreciate your help.


Dream as if you will live forever , live as if you will die tomorrow.
Re: Rear sprocket removal
Bill Long #798340 02/15/20 12:38 am
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20 minutes?

Re: Rear sprocket removal
Bill Long #798354 02/15/20 3:32 am
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Bill: Is this the type of wheel/brake you have? If so you need to disconnect the brake rod then take off the outside nut and draw out the stud axle from the swingarm and lift off the alloy plate and brake assembly. Yes the shoes will come with the plate and the sprocket can then be lifted off.

Gordo

Click to enlarge

[Linked Image from i.postimg.cc]


The roadside repairs make for the best post ride stories.
Re: Rear sprocket removal
Bill Long #798365 02/15/20 6:00 am
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Originally Posted by Bill Long
Ok, so the ''left side axle'' needs to be disassembled? to expose the shoes to remove the sprocket? Wow/// that seems like a ridiculous amount of work / trouble to just R n R the sprocket. But, i have no choice. I guess that's why i have ridden American and Jap bikes mostly since 1968.

Thank you very much, i appreciate your help.


Waah! How often do you expect to have to change your wheel sprocket?

Ever tried to get the carburetor assembly off a Honda Nighthawk? Now THAT'S ridiculous!


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: Rear sprocket removal
Bill Long #798382 02/15/20 2:30 pm
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Yes Gordo, that's my qd set up. I removed everything from the L/S, to the bench. I have removed the brake stay arm, removed the round nut , the 8 bolts that secure the sprocket to the hub/drum. The drum / plate is still intact together, the sprocket is completely loose and and can be moved around BUT it will not ''come over'' the brake assy. So, you are saying, i need to separate the brake plate from the drum to get sprocket off? Does that just come apart or do i need to press them apart or???
Thanks for your help, been working on bikes since 68 but never Brits till last year i picked up a 71 Bonnie and now a 69 T-Bolt, sorry if i ask rookie questions, i hate to break things because of stupidity.
Bill


Dream as if you will live forever , live as if you will die tomorrow.
Re: Rear sprocket removal
Bill Long #798384 02/15/20 3:11 pm
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Yes, remove brake backing plate. It should just slip apart.


Bill
1974 Norton Commando
1966 Lightning
1965 Lightning Rocket
1966 Norton Atlas
1967 Norton Atlas
1948 Panhead
Re: Rear sprocket removal
Bill Long #798385 02/15/20 3:16 pm
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Brake plate has to come off first, assumed you had already done that, no press needed but the brake arm will need to be applied slightly to move the shoes away from the drum as the spring will move it back once the brake rod is taken out. This will be made more difficult if the shoes have worn the drum and left a lip the shoes have to get over so try different brake arm positions.

For B25 but B65 is same except for some dimensions.

https://www.youtube.com/watch?v=iH2-YtlQbk4

https://www.youtube.com/watch?v=Cssbq4u8dUU

Re: Rear sprocket removal
Bill Long #798386 02/15/20 3:29 pm
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If you are only removing 8 bolts from the rear sprocket , It must be a 71 - 72 hub.


1968 BSA Firebird
1200 HD
XS 1100
1972 Rickman 125
Re: Rear sprocket removal
Bill Long #798387 02/15/20 3:56 pm
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No QD hub on a 71-72 so it must be 70 or earlier.

Re: Rear sprocket removal
Bill Long #798388 02/15/20 4:57 pm
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Kommando had it; with the axle nut removed, the only thing that can be holding the brake assy. to the drum is the brake shoes pushing out against the drum, and possibly catching on a lip if one has developed due to wear on the drum.

If worse comes to worst, you can always remove the brake actuating lever and pull the backing plate off the shoes, then remove the shoes from the drum. If the lip on the drum is that bad, your drum may need to be machined or replaced.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: Rear sprocket removal
Bill Long #798392 02/15/20 6:17 pm
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I just had the same issue. Use a mallet and give the protruding axel several wacks, the brake shoe assembly will pop off allowing access to the sprocket. There’s a lot of things about BSA they could have done better, but quirks are what we love about them!

Re: Rear sprocket removal
Bill Long #798395 02/15/20 7:18 pm
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Considering the price of BSAs was much less than the likes of Triumph and Norton, the things they “could have done better” were outweighed by the cost of doing them better. Strangely though this QD system is actually one of the best systems used. The original drums were fixed sprockets and the steel brake plates of previous generations were bigger OD than the later.

For the amount of times you need to change the sprocket to how
Many times you would need to get the tyre off, the ease of the QD is far superior to the straight through spindle as used on many Japanese bikes, where you need to drop the chain off the sprocket, release the rear brake rod, torque stay etc each time you want to change the tyre.


beerchug

(Display name changed for cyber security reasons)

Re: Rear sprocket removal
Bill Long #798402 02/15/20 7:56 pm
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Does anyone have the heart to tell Bill since he finds removing a rear sprocket to be such a challenge that if the rear sprocket is worn to the extend it needs changing the gearbox sprocket will almost certainly be history as well

Imagine the degree of difficulty with that

Theoretically with bikes, but in actuality in industrial maintenance work sprockets should always be replaced in pairs , along with new chain.........but i know that with bikes that seldom happens (im guilty of that failure as well)

Last edited by Ignoramus; 02/15/20 8:00 pm.

"There's the way it ought to be and there's the way it is" (Sgt Barnes)
Re: Rear sprocket removal
Ignoramus #798403 02/15/20 8:04 pm
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Originally Posted by Ignoramus
Does anyone have the heart to tell Bill since he finds removing a rear sprocket to be such a challenge that if the rear sprocket is worn to the extend it needs changing the gearbox sprocket will almost certainly be history as well

Imagine the degree of difficulty with that

Theoretically with bikes, but in actuality in industrial maintenance work sprockets should always be replaced in pairs , along with new chain.........but i know that with bikes that seldom happens (im guilty of that failure as well)


Lol. Since the front does twice as much work as the back if not more, then the rear is a walk in the park, removing the primary drive, just to get to the clutch trapdoor then finding the right box spanner/ socket to undo the sprocket nut, the rear would seem like a walk in the park.


beerchug

(Display name changed for cyber security reasons)

Re: Rear sprocket removal
Bill Long #798414 02/15/20 11:01 pm
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Danam, hit the nail on the head, AFTER removing brake plate, couple whacks is what it needed. Seems still waay to much work to replace sprocket. I just did an 80 CR250R
so much simpler. Anyway, reminds me of the time many moons ago i was doin a clutch in a 66 big block Corvette, had everything loose pulled and twisted, wiggled trans would come back bout 3 inches but not all way out.... could not figure it out... went and got shop manual and there was my answer....Remove ashtray to remove transmission! If you remember the ashtray was in the tunnel on floor and protruded thru floor. I removed ashtray and trans slid right back out of the clutch / bell housing. Every manufacturer has some quirks, i guess.
Many thanks for all the help guys, i appreciate you!
God Bless


Dream as if you will live forever , live as if you will die tomorrow.
Re: Rear sprocket removal
Bill Long #798436 02/16/20 7:58 am
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Whatever an 80 CR250R is, I'm glad the sprocket changes easily. But a some of us here LIKE our Beezers, and patiently work away at them doing whatever it takes.

Re: Rear sprocket removal
Bill Long #798513 02/17/20 2:10 am
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Bill: Have you ever changed the rear sprocket on a drum brake HD Ironhead Sportster? Those can be a little annoying.

Re: Rear sprocket removal
Bill Long #798567 02/17/20 7:55 pm
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Originally Posted by Bill Long
Ok, so the ''left side axle'' needs to be disassembled? to expose the shoes to remove the sprocket? Wow/// that seems like a ridiculous amount of work / trouble to just R n R the sprocket. But, i have no choice. I guess that's why i have ridden American and Jap bikes mostly since 1968.

Thank you very much, i appreciate your help.


The QD A65 rear wheel is virtually identical to the pre unit QD wheel, the main differences being the speedo drive dog and alloy brake plate.
When the brake drum is off the swing arm the brake plate complete with shoes just lifts off.

If you are saying the drum needs removing from the swing arm and it seems an unnecessary hassle to remove it, of course it needs removing, you can't remove the sprocket from your 80 CR250R without removing the wheel can you?


BSA B31 500 "Stargazer"
Greeves 200 "Blue Meanie"
Greeves 350
Greeves 360
Suzuki GSX1100 EFE "Sorcerers Apprentice"
GM500 sprint/LSR bike "Deofol"
Jawa 500 "Llareggub"
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Re: Rear sprocket removal
leon bee #798637 02/18/20 12:50 pm
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Honda CR250R


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Re: Rear sprocket removal
leon bee #798638 02/18/20 12:52 pm
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Yes on the Sporty, my 68 CH and my 72XLH


Dream as if you will live forever , live as if you will die tomorrow.
Re: Rear sprocket removal
Bill Long #798655 02/18/20 6:16 pm
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Tell you what Bill ..........God knows why but on this board we love our silly old obsolete BSA's with their idiosyncratic behavior , silly thread systems, design flaws, marginal oil pumps , crank bearing systems , archaic electrics and lack of hand warmer bar grips...........DANG we dont even have petrol gauges , computerized fuel management and the seats are too small to get a girl with the classic hour glass figure on the back very easily

Now i think about it what do BSA's have going for them (that was rhetorical) compared to a masterpiece of motorcycling style that is the mighty Honda 250. Sure the Honda has the personality of a lawnmower or any other small engined appliance one might use to maintain their property . They sound like a sewing machine and are dull.

ON the other hand BSA's just plain look good

BLAST.........hold on............... I think I hear my Kawasaki over revving ........oh no sorry false alarm that was my washing machine on spin cycle


"There's the way it ought to be and there's the way it is" (Sgt Barnes)
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