Fitting ADV gearing to a standard box

[Steptoe]

Today i have mostly busy fitting special order ADV 1st and 6th gearing to a standard gearbox.
And replacing a snapped output shaft.

Standard 1st gear.



ADV high 1st gear.



And the box internals.



What the output shaft should look like.



And what it looks like after the splined end has sheared off due to a snapped shaft U/J .



The snapped U/J with the splined end stuck in the end.



And a nice new shaft £££ !!!

 

[Colban]

Someone pop a wheelie too many ?.

A quick question....Is it possible to fit an Adventure,ie low 1st gear to a std GS box while retaining the high 6th gear ?.
Do you not have to change the matching gears on the intermediate shaft ?.
I like the 6th for relaxed cruising but find 1st too high around town.
Was it difficult and expensive to buy the gears ?.

 

[Steptoe]

I'm sure you can fit just the 1st gear .

I'm doing another one this week so will know for sure 100% -

I didn't buy the gears, the owner bought them secondhand. I made a note of the amount of teeth on normal and standard gears. But not here with me, i'll look tomorrow.

 

[motobiker]

Out of interest (ok I want to know how much i saved) how much IS a new shaft?


also would i be right in thinking that you can't fit a 6th gear into an 1100 box?

 

[Big Jets]

Out of interest (ok I want to know how much i saved) how much IS a new shaft?


also would i be right in thinking that you can't fit a 6th gear into an 1100 box?

That would be something I might consider ,is it a possibility

 

[Steptoe]

Out of interest (ok I want to know how much i saved) how much IS a new shaft?


also would i be right in thinking that you can't fit a 6th gear into an 1100 box?

For an 1150 ADV a new shaft is £290ish plus VAT.

You can't fit a sixth gear into an 1100 box ( well you can, anything is possible, but at humunguous cost).

Not sure if it's possible to fit the sixth gear in a 1100 box in place of the fifth gear ??? I can't remember the detail of the 1100 output shaft i.e. diameter and shaft locating teeth.

 

[Voyager]

Do you not have to change the matching gears on the intermediate shaft ?.

As we have been discovering in the 'Airhead Section', it is possible to change the gearing by changing a single gear wheel - not the meshing pair (as I originally thought).

Its done by some cunning manipulation of the tooth form - but it seems its only possible (on the gearboxes we have) to adjust the ratio up or down by one tooth (which, on the paralever Airhead boxes gives about a 6% difference).

If you want more than one tooth difference you will have to change a pair of gears - then other ratios are likely to be affected as well.

See here (fascinating reading )

http://www.gunsmoke.com/motorcycling/r100gs/tranny/index.html


Bob.

 

[Steptoe]

to adjust the ratio up or down by one tooth (which, on the paralever Airhead boxes gives about a 6% difference).

.

The 1150 box has a difference of 8-10 teeth between the gears available. I made a note of the total teeth on each gear, but it's in the workshop, not here in front of me.

 

[motobiker]

For an 1150 ADV a new shaft is £290ish plus VAT.

Not sure if it's possible to fit the sixth gear in a 1100 box in place of the fifth gear ??? I can't remember the detail of the 1100 output shaft i.e. diameter and shaft locating teeth.

err... EEK. glad my man managed to source a 'nearly new' 2nd hand one then. £80 inc vat.

yes.. for replacing the oe 5th gear... that was what I meant. something a little bit higher would be great for faster roads... (well we can dream)

 

[Colban]

err... EEK. glad my man managed to source a 'nearly new' 2nd hand one then. £80 inc vat.

yes.. for replacing the oe 5th gear... that was what I meant. something a little bit higher would be great for faster roads... (well we can dream)

A relatively easy way of raising the overall gearing would be to fit a bevel box from an 1150.3.00:1 of the 1100 to 2.82:1 of the 1150.

 

[the celt]

A relatively easy way of raising the overall gearing would be to fit a bevel box from an 1150.3.00:1 of the 1100 to 2.82:1 of the 1150.

Done this last week...
Top end speed far better
less vibs through foot rests
but lossing alot of engine brake'n
in country roads, much prefare the standard
1100 bevel box over all

 

[davegs]

A relatively easy way of raising the overall gearing would be to fit a bevel box from an 1150.3.00:1 of the 1100 to 2.82:1 of the 1150.

I did the reverse to my 1150 for lot of big offraopd miles just to lower the bottom gear very sucessful especially for comuting in traffic as well, no more clutch probs.
dave (Abba fan) GS

 

[Voyager]

The 1150 box has a difference of 8-10 teeth between the gears available. I made a note of the total teeth on each gear, but it's in the workshop, not here in front of me.

I suspect that 9 teeth is the norm, allowing one tooth variation up or down.

I'll be interested to hear though as I may well be wrong (and one never stops learning).

Bob.

 

[Steptoe]

I suspect that 9 teeth is the norm, allowing one tooth variation up or down.

.

NO i meant 8-10 ( can't remember precisely) teeth difference betwen the two, not one single solitary tooth difference. Thats for engines with no torque

 

[PIGGLET]

Kewel, I want to know how to do this
Is it fairly straight forward to strip the box and change the gears once you've got the box off the bike? I've got a standard 1st on my ADV which is wayyyyy too feckin tall and want to fit the enduro cog this winter.
Whats the general consensus on the O/D 6th gear? Better than the lower ADV gear?

 

[Steptoe]

Standard 1st gear = 45 teeth
Low 1st gear = 38 teeth

Standard 6th gear = 23 teeth
High 6th gear = 29 teeth.

 

[Voyager]

Standard 1st gear = 45 teeth
Low 1st gear = 38 teeth

Standard 6th gear = 23 teeth
High 6th gear = 29 teeth.

Neil,

At the risk of labouring the point . . .

Can you swap just one gear, or do you change the meshing pair ?

It seems incredible that gears that are that different can be swapped in isolation

One day I'll understand

Bob.

 

[robc]

Morning,
Was there ever a definitive answer to this question? I need a low first gear for off road but also keep my high 6th for the motorway.

Regards

RobC

 

[(RIP) Kaister]

At the risk of being overly pedantic and labouring the point .....

gears in a 'box are ratio's

its confusing to most people to refer to gears as pinions ( which are single toothed gears )

a gear is 17:37, 15:38 etc etc ( mainshaft/layshaft )

a pinion ( or 'gear' , cog etc ) is 36 teeth, 42 teeth etc etc

can you refer to the gear sets as ratio's to clarify ?


( ex-Tyrrell F1 raceteam G'box man )

 

[robc]

Ok, your with is thy demand.

I still want to have a low first ratio whilst retaining the existing high ratio sixth.

I came across this thread this morning but it was left hanging with no definitive answer.

Regards

Rob C