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General Category => General Discussion => Topic started by: JesperN on October 04, 2025, 06:49:07 AM
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Hi. I have a heavily modified Lemans 4 that has approx. 140 000 km by now. The gearbox is awful. I shimmed the selector drum last winter. Didn't help much. Nothing inside looks bad or worn down. But the synchronization between the higher gear is bad. I have changed all the bearings. But are there anything in the gearbox that functions as sync rings? Never thought about this before.
Another thought is that the selector drum and possibly the forks are worn. Is this a common issue on high mileage Guzzis?
Sincerely Jesper
(https://i.ibb.co/kgD5qgt3/My-bike.jpg) (https://ibb.co/kgD5qgt3)
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All gears are in constant mesh. Synch rings are for engaging mating gears. These gears are always engaged. Shifting only determines which gear is locked to the output shaft. Crude but effective drive dogs there CLUNK and you are rolling. With practice it can become click if you are not in a rush.
(https://i.ibb.co/TxHTB3jj/20190807-213637.jpg) (https://ibb.co/TxHTB3jj)
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Here's a good YouTube on the old five speeds:
https://www.youtube.com/watch?v=c1WIjtceX-A&t=1134s
It might even be able to contact him with your questions if you can figure it out from the turtorial.
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Here's a good YouTube on the old five speeds:
https://www.youtube.com/watch?v=c1WIjtceX-A&t=1134s
It might even be able to contact him with your questions if you can figure it out from the turtorial.
Thanks. Have seen it. Was very useful when i opened the gearbox last winter.
Regards Jesper
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There are shifting dogs that get rounded off and at higher rpm's won't mesh to allow gear engagement.