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Gearbox

Technical help for Series one, two and three Lambrettas. Models include the Li, Li Special, TV, SX, GP, Serveta and API/SIL models

Gearbox

Postby Seamus murphy » Mon Jan 02, 2017 1:10 pm

Seams ive got an indian gearbox
50 42 38 35 and 10 12 16 19 tree ive searched everywhere to work out its a indian gp 150 mark 1 gearbox ive got a ts1 225
Anyone running this gearbox or had any experiance of it thanks
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Re: Gearbox

Postby Marty ULC » Tue Jan 03, 2017 5:00 am

If it's the same as my Indian 150 gearbox that's sitting on the shelf (same 1st 3 gears as a gp125/200) then it's got a big gap between 3rd and 4th, I struggled to get a workable ratio using it so swapped it out for an Indian 200 gearbox.
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Re: Gearbox

Postby HxPaul » Tue Jan 03, 2017 7:49 am

Seamus murphy wrote:Seams ive got an indian gearbox
50 42 38 35 and 10 12 16 19 tree ive searched everywhere to work out its a indian gp 150 mark 1 gearbox ive got a ts1 225
Anyone running this gearbox or had any experiance of it thanks

Its a GP150 Indian Vijai Super,it has a different 3rd gear from the GP150/SX150 and reduces the 3rd to 4th gear gap.I run the same gearbox in my series 2 with 18x47 sprockets and a Casa 185 top end.I'm currently building a Casa 210 with the same gearbox and sprockets,this will be going in my series 3 scooter.
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Re: Gearbox

Postby Knowledge » Tue Jan 03, 2017 8:29 am

I think I have one of these on the shelf.

Although the gap from 3rd to 4th is smaller than a traditional GP150 box, the gap from 2nd to 3rd is huge (33%??).

I need to check this, but then you can do the maths now you have the numbers of teeth.
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Re: Gearbox

Postby HxPaul » Tue Jan 03, 2017 10:23 am

Its the same as the Indian GP200.
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Re: Gearbox

Postby Seamus murphy » Wed Jan 04, 2017 6:17 pm

Thanks for replying
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Re: Gearbox

Postby holty » Wed Jan 04, 2017 7:53 pm

as above answers realy, its more or less the same as an indian gp200 with a slighty shorter 4th gear very useable with the correct sprockets, not to be confused with the later mk2 version which is a shocker of a gearbox with big jumps between the gears.
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Re: Gearbox

Postby Seamus murphy » Fri Jan 06, 2017 1:58 pm

Thanks holty
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Re: Gearbox

Postby dscscotty » Fri Jan 06, 2017 4:54 pm

Its the same as the Indian GP200.


Just to confirm this is an Indian 150 box,although some 200cc scooters/engines were imported in the late 90's with this fitted as the factory/supplies/production reduced.
The correct Indian GP 200 cluster is 10-12-16-18 and has the closest ratio between 3rd and 4th.
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Re: Gearbox

Postby HxPaul » Fri Jan 06, 2017 6:29 pm

I was answering Knowledge where he says "the gap from second to third is huge"
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