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Montesa 301 RR Clutch Issues


Montesa301
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I believe it's the smaller gear (behind the primary gear), which meshes with the kickstart idler gear, that backs out. 

Mitani has a writeup about it here: http://mitani-ms.jp/info/2013/09/rtl-f-clatch-outer/ 

It's in Japanese, but my browser did a good enough job of translation to get the idea. Mitani makes an improved part, but it's not clear how they improve it: https://mitani-kobe.shop-pro.jp/?pid=60396201

Edited by sportsawyer
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On 5/12/2026 at 4:43 PM, Montesa301 said:

I had it apart again today and it had pushed itself out again. I have heard of people machining a grub screw in to hold it but I’m not brave enough to attempt that!

Perhaps something like LOCTITE 270 anaerobic permanent adhesive could help or a strong bearing retaining anaerobic adhesive. such as LOCTITE 638

Edited by Tr1AL
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Shouldn’t have come apart like that. A new one won’t be cheap but a 2nd hand one may be worth a try. I would think Richard Allen trials spares would have some. If you’re really stuck I have one on a spare engine. 

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36 minutes ago, jrsunt said:

Shouldn’t have come apart like that. A new one won’t be cheap but a 2nd hand one may be worth a try. I would think Richard Allen trials spares would have some. If you’re really stuck I have one on a spare engine. 

I know who you are and that you are a serious rider on Honda machinery  and therefore know what you are talking about but Mitani who have pretty good knowledge of the Honda motors  engineering wise reckon this movement can happen in approx 1 year of use.  With the amount of torque the motor produces and the abrupt use of clutches in trials sections ,as happens, then an interference fit steel part in a softer aluminium outer part is going to start twisting and enlarging the alloy part in the same way that the rivet holes on the clutch bell elongate in the end and give rise to slop. I am happy to go with Mitanis' view based on engineering.

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