Author Topic: Gearbox sprocket  (Read 1227 times)

Offline chaterlea25

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Re: Gearbox sprocket
« Reply #15 on: 02.07. 2017 14:04 »
Hi, Roy
Have you tried the bike with the sidecar before changing the gearing?
I have found that certainly A10's are under geared on standard 1950's gearing
I am running +2 teeth on standard on the crank
Traffic moves a lot faster nowadays  *ex* *ex*

John
1961 Super Rocket
1963 RGS (ongoing)

Online JulianS

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Re: Gearbox sprocket
« Reply #16 on: 02.07. 2017 14:07 »
The cush drive nuts need to be very tight or they damage the chaincase if they unscrew.

You may find yours has been carefully tightened with a hammer and drift and if so may need similar tools to undo it.

If the nut is good you can use a Citreon ball joint socket to undo it - it fits a treat on a new nut - but you need a 35 mm spanner to fit the tool. I sent details to The Star the BSAOC magazine last year and it featured in the march 2016 issue.

You find the tool on ebay.

SRM do a hex replacement nut.

There is a lock washer but it is difficult to bend it up due to the cush spring and I always use thread locker.

Offline RoyC

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Re: Gearbox sprocket
« Reply #17 on: 02.07. 2017 14:30 »
Hi Roy.

 A decent way to remove the cush drive nut, and install it to 65 pounds.

 I would pick up a shim set for the engine sprocket if you dont have one. Might not need any, might need them all.

Lee
Thanks Lee.
Shim set ordered.
Roy.
My bike is a 1958 A7SS
Staffordshire UK

Online Black Sheep

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Re: Gearbox sprocket
« Reply #18 on: 02.07. 2017 14:41 »
Our Gold Flash combo ran on standard gearing for years with a child/adult sidecar, usually full of 2 fighting brats plus paraphernalia. I'm pleased to say the 2 fighting brats are now respectable parents with their own fighting brats and the Gold Flash is liberated as a solo. So try it first and see.
2 twins, 2 singles, lots of sheep

Offline RoyC

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Re: Gearbox sprocket
« Reply #19 on: 02.07. 2017 14:45 »
Hi, Roy
Have you tried the bike with the sidecar before changing the gearing?
I have found that certainly A10's are under geared on standard 1950's gearing
I am running +2 teeth on standard on the crank
Traffic moves a lot faster nowadays  *ex* *ex*

John
Hi John
I haven't even ridden the bike yet.
I am having the sidecar made by Watsonian-Squire.
Similar to this one.
My bike is a 1958 A7SS
Staffordshire UK

Offline RoyC

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Re: Gearbox sprocket
« Reply #20 on: 02.07. 2017 14:48 »
Our Gold Flash combo ran on standard gearing for years with a child/adult sidecar, usually full of 2 fighting brats plus paraphernalia. I'm pleased to say the 2 fighting brats are now respectable parents with their own fighting brats and the Gold Flash is liberated as a solo. So try it first and see.

I will.
At least I will have the gear to do the job if required.
Thanks for that.
Roy.
My bike is a 1958 A7SS
Staffordshire UK

Offline RoyC

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Re: Gearbox sprocket
« Reply #21 on: 02.07. 2017 14:55 »
The cush drive nuts need to be very tight or they damage the chaincase if they unscrew.

You may find yours has been carefully tightened with a hammer and drift and if so may need similar tools to undo it.

If the nut is good you can use a Citreon ball joint socket to undo it - it fits a treat on a new nut - but you need a 35 mm spanner to fit the tool. I sent details to The Star the BSAOC magazine last year and it featured in the march 2016 issue.

You find the tool on ebay.

SRM do a hex replacement nut.

There is a lock washer but it is difficult to bend it up due to the cush spring and I always use thread locker.
Thanks for that. Even if I end up not having to do it, I will know how to.  *beer*
This is my gear at the moment.
My bike is a 1958 A7SS
Staffordshire UK

Offline chaterlea25

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Re: Gearbox sprocket
« Reply #22 on: 02.07. 2017 19:23 »
Hi Roy
If you have the primary cover off its well worthwhile to check that the cushdrive nut is fully tightened
If left otherwise it will lead to crank shim failure *warn*

John
1961 Super Rocket
1963 RGS (ongoing)

Online JulianS

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Re: Gearbox sprocket
« Reply #23 on: 03.07. 2017 09:25 »
Roy

Doing any work on the left side of a sidecar equiped bike is quite challenging due to the confined space between bike and chair.

You need to be completely happy with the condition of the sprockets chains and the clutch and with the gearing before the chair is fitted because getting at it afterwards will be difficult.

Offline RoyC

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Re: Gearbox sprocket
« Reply #24 on: 03.07. 2017 10:05 »
Roy

Doing any work on the left side of a sidecar equiped bike is quite challenging due to the confined space between bike and chair.

You need to be completely happy with the condition of the sprockets chains and the clutch and with the gearing before the chair is fitted because getting at it afterwards will be difficult.
Thanks Julian,
If I have to do any work on the bike when sidecar is fitted I will have to take the chair off so that I can get the bike on the lift.
Not room to get combo on the lift.  *sad2*
My bike is a 1958 A7SS
Staffordshire UK