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Three speed gearbox change

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Three speed gearbox change

Post  pecon4 on Wed Feb 22, 2017 10:43 pm


Is it possible to change the three speed box for a four speed unit if I were to locate one and if so are there any difficulties to be aware of?. I'm a long way from worrying about this as I have only started in on the restoration and am still waiting on a coil to try to start the bike, but If this were possible I think a four speed would be the way to go.

Peter

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$ speed conversion

Post  piston 197 on Thu Feb 23, 2017 8:30 am

You do not say which engine /frame/model you have ??
If it is a 10D or 6E engine some surgery needs to be done to the crankcases
if an 8E then 4 speed box will go straight on, but you will also need new 4 speed clutch centre, new k/start , new gear lever and will either need a 4 speed inner clutch cover, ( or block up one bolt hole on the 3 speed case)
If a 10E engine 4 speed box is a straight replacement, but you will need a 4 speed outer timing case and a bit of surgery is required to the frame to clear the gearbox bottom case.

Sorry cannot be more helpful than this without knowing what you wish to fit a 4 speed gearbox to ?? little bit more information in future please

JH
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Re: Three speed gearbox change

Post  Jack Clegg on Thu Feb 23, 2017 11:08 am

The main problem I ran into was the barrel on the 3 speed was the cast in inlet stub, which will not clear the 4 speed box. You need a barrel with a cranked/bolt-on inlet stub.
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Carb manifold

Post  piston 197 on Thu Feb 23, 2017 1:47 pm

The previous post is true for the 8E engine, but for the 10E engine same manifold can be used

Still waiting to hear which engine you have,/ model bike you have and can then advise further ?

JH
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Detective work

Post  piston 197 on Thu Feb 23, 2017 1:56 pm

Doing a bit of detective work I see you have previously asked about removing an 8E back plate so I am assuming it is this bike you are seeking to change the gearbox on ?

There are two gearboxes you can use, both are Albion 4 speed
Type 1 has serial no beginning "V" this is the trials box with low 1st and 2nd gear , not really suitable for the road bike
Type 2 has serial No beginning "S" and is the one required for a road bike
There is a 3rd type with serial No beginning "R" this has one reverse and 3 forward gears , this is no use at all
you will also need
1, 4 speed clutch centre
2,correct carb manifold
3, gearbox sprocket and retaining nut for 4 speed gear box
4, clutch inner case for 4 speed ( or block off one hole in 3 speed case
5, 4 speed gear lever
6, 4 speed k/start
7, different clutch cable ( about 10" shorter)

JH
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Re: Three speed gearbox change

Post  pecon4 on Thu Feb 23, 2017 2:47 pm

J.H. apologies for not getting back sooner, still having some computer glitches. It is indeed the '57 Falcon 74 with the 8E engine that I was thinking about. I came across a guy who was advertising a Villiers engine with four speed gearbox but gave no other details which is what got me to thinking of the possibilities. Many thanks for the very detailed reply. Thanks also to Jack for your reply. Forgive my lack of knowledge of the mark but did any 8E's come with four speed boxes as standard?.

Peter

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4 speed option

Post  piston 197 on Thu Feb 23, 2017 2:55 pm

Yes there was a 4 speed option available for some years of the FB production certainly on the Falcon 67,70 and 74
I have a couple of engines with 4 speed gearboxes I think, both as found, but would yield the parts you need , except gear change and k/start

JH
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Manifold Stub

Post  kerabo on Thu Feb 23, 2017 7:29 pm

Offset stub on eBay

Ken
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Re: Three speed gearbox change

Post  pecon4 on Fri Feb 24, 2017 11:34 am

Thanks Ken, much appreciated.

Peter

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Re: Three speed gearbox change

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