350 Road 3rd gear slipping out

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George
Posts: 412
Joined: Fri Feb 14, 2020 2:51 am
Location: Essex UK

350 Road 3rd gear slipping out

Postby George » Sun Oct 08, 2023 6:57 pm

I have covered a few enjoyable miles on the restored 1976 Mototrans 350 Road apart from one problem. Whether changing up into 3rd or changing down into 3rd bike slips out of gear. No problem with other 4 gears so don't think selector is the cause. Before I think about a winter strip down any suggestions of what to look for would be appreciated.
George S Essex UK

Jordan
Posts: 1448
Joined: Fri Dec 24, 2010 11:29 am

Re: 350 Road 3rd gear slipping out

Postby Jordan » Sun Oct 08, 2023 9:11 pm

Suspect rounded dogs on gears 2 & 3 on the output shaft.

Duccout
Posts: 1400
Joined: Wed Feb 05, 2020 1:20 pm
Location: Essex UK

Re: 350 Road 3rd gear slipping out

Postby Duccout » Mon Oct 09, 2023 6:51 am

Hi George,

From what I've seen on Spanish sites it seems to be a common problem. All is not lost though, there is a simple fix (if you are lucky). Often the cause is wear between the tang of the selector drum and the claw of the shaft from the selector box, which means that the gears are not being pushed into position properly. If you take some shim (as thick as will fit while allowing the parts to fit easily) and bend it around the tang to take out the play, then you may have no more trouble.

I know that this works because I have done it with success. I guess that in the long run the tang can be built up with stellite and ground for a good fit.

Good luck,


Colin

George
Posts: 412
Joined: Fri Feb 14, 2020 2:51 am
Location: Essex UK

Re: 350 Road 3rd gear slipping out

Postby George » Mon Oct 09, 2023 11:41 am

Duccout wrote:Hi George,

From what I've seen on Spanish sites it seems to be a common problem. All is not lost though, there is a simple fix (if you are lucky). Often the cause is wear between the tang of the selector drum and the claw of the shaft from the selector box, which means that the gears are not being pushed into position properly. If you take some shim (as thick as will fit while allowing the parts to fit easily) and bend it around the tang to take out the play, then you may have no more trouble.

I know that this works because I have done it with success. I guess that in the long run the tang can be built up with stellite and ground for a good fit.

Good luck,


Colin

Hi Colin, thanks for suggestion but I would have thought that I would have trouble with other gears and they are working well.

Hi Jordan, your suggestion sounds feasible. Shame to have to strip engine after recent restoration but I didn't realise how often I used 3rd gear until I couldn't. Going from 2nd straight to 4th is not a good idea in traffic. Owning classic bikes is never easy, at least I can use the Elite, like to ride all year so can expect plenty of cleaning / polishing.
George S Essex UK

Duccout
Posts: 1400
Joined: Wed Feb 05, 2020 1:20 pm
Location: Essex UK

Re: 350 Road 3rd gear slipping out

Postby Duccout » Mon Oct 09, 2023 12:28 pm

Hi George,

Check your messages, I have sent you a couple of PMs.

Cheers,

Colin

George
Posts: 412
Joined: Fri Feb 14, 2020 2:51 am
Location: Essex UK

Re: 350 Road 3rd gear slipping out

Postby George » Mon Apr 29, 2024 11:57 am

Duccout wrote:Hi George,

From what I've seen on Spanish sites it seems to be a common problem. All is not lost though, there is a simple fix (if you are lucky). Often the cause is wear between the tang of the selector drum and the claw of the shaft from the selector box, which means that the gears are not being pushed into position properly. If you take some shim (as thick as will fit while allowing the parts to fit easily) and bend it around the tang to take out the play, then you may have no more trouble.

I know that this works because I have done it with success. I guess that in the long run the tang can be built up with stellite and ground for a good fit.

Good luck,


Colin


Following Colin's (Duccout) advice with regards to 3rd gear slipping out I have shimmed between gear selector drum tang and selector box slot to take up wear and this has cured my problem. Thanks for saving me an unnecessary strip down Colin, PM sent.

A simple solution that might be useful to any other owners of Mototrans widecase motorcycles
Now I can start using it, hoping for a dry summer!
George S Essex UK

DBDBrian
Posts: 208
Joined: Mon Mar 30, 2015 11:29 pm

Re: 350 Road 3rd gear slipping out

Postby DBDBrian » Mon Apr 29, 2024 7:22 pm

Well done both, good result, simple things first.
Brian
Brian
Made in England

Jordan
Posts: 1448
Joined: Fri Dec 24, 2010 11:29 am

Re: 350 Road 3rd gear slipping out

Postby Jordan » Mon Apr 29, 2024 10:11 pm

I agree - a good result, simply achieved.

Ventodue
Posts: 958
Joined: Mon Mar 08, 2010 3:23 pm
Location: Montpellier, France

Re: 350 Road 3rd gear slipping out

Postby Ventodue » Tue Apr 30, 2024 10:03 am

Good man, Colin :)

Duccout
Posts: 1400
Joined: Wed Feb 05, 2020 1:20 pm
Location: Essex UK

Re: 350 Road 3rd gear slipping out

Postby Duccout » Wed May 01, 2024 6:07 am

I'm not saying that it will last, but as a temporary fix it can be useful.



Cheers,


Colin


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