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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 11-08-2012, 09:01 AM   #1 (permalink)
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Grand Prix 125
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Other Motorcycle: 1971 BONNEVILLE
Gearbox gear installation

I have a 1971 Bonneville T120R with a 4-speed transmission. I took off the inner gearbox cover to replace the leaf spring. A gear on the bottom shaft (layshaft?) closest to the inner gearbox cover came off. It has 30 teeth so I'm guessing it's the Layshaft Low Gear. It has a flat side with the opposite side being indented or dug out I will say. One questison is which side faces the middle of the bike? Hope this makes sense. The other question is regarding indexing. Will I have a problem with this if I have not moved anything inside of the gearbox?

Thanks,
Boc De.
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Old 11-08-2012, 10:26 AM   #2 (permalink)
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Boc De,

Check this and other videos produced by "Lunmad" on YouTube.


They are invaluable.
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Sam Murray

Aberdeen, Scotland
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Old 11-08-2012, 10:55 AM   #3 (permalink)
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The raised lip around the centre faces inwards.
It will need to be indexed because the quandrant has dropped
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Old 11-08-2012, 11:32 AM   #4 (permalink)
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Grand Prix 125
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Thanks for the information and the youtube link! I shall give it a go tonight when I get home.

Thanks, again,
Bob De.
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Old 11-09-2012, 09:49 PM   #5 (permalink)
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Grand Prix 125
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Again, thanks for the information. I found the Triumph Manual to have exactly what I needed as far as indexing. It shows exactly where everything should be and describes exactly as well. My gearbox is in great shape now. Woo Hoo!!

Bob De.
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