Gearbox parts

[Hooleymyster]

Not trying to incite you. The only way two unintended gears can engage is if they move out of position while other gears are engaged/engaging. The circlips are the culprit. After the damage is done, the gears bang the clips back into the groove. The side load on the shift forks is not enough to get them bent prior to the gear damage, but the gears damage may bend the forks in the process of getting chewed up. So, the solution to prevent future mayhem, new gears and shift forks. You can go back to stock circlips, but it just gets you back to the point you were prior to the grinding. Improving on the strength of the circlips/groove is insurance they will more likely stay where they are intended to be. You can send the new gears you have bought to Robinson and they will use them for the rebuild. I understand it’s an international shipment for you, but I can say my transmission is noticeably smoother and definitely stronger than before. Picture included to show you where I have been. My improvements involved the improved billet 4th gear, wider/stronger clips/grooves, and back cut teeth on the gear dogs. My total cost with Robinson’s work and my new shift forks and gaskets for the repair was under $800. 2nd option mentioned before, find a local drag racing motorcycle transmission shop. They will know about back cutting dogs and how to strengthen the system

No problem at all, appreciate the advice. Is there a recommendation for circlip and new depth of groove?. I have access to lathes. Will look for local gear experts. Many thanks

 

[SMLWNKR]

No problem at all, appreciate the advice. Is there a recommendation for circlip and new depth of groove?. I have access to lathes. Will look for local gear experts. Many thanks

I have been told the shafts are hollow so deeper grooves would weaken it too much. The grooves are therefore widened and thicker clips (stronger due to more material) are used. The issue is one side of the groove is at a specific point on the shaft to position the gear at the right spot when it is against the clip, and the gear slides away from or against the clip during shifting so only one side of the groove is cut. I cannot tell you which side or how much. But Robinson knows from experience. Too technical for me to say much more without giving wrong advice. Wish it were an easier solution. Seriously though. Check these guys out. Robinson Industries Motorcycle Transmissions

 

[Gerald]

I am concerned that if my 2014 R3 Gearbox or Final drive was to break in the future would i still be able to get parts or would the bike be scrap? I don't want to sell it as i like the look and size of it.

I feel we're safe for a reasonable amount of time but sometimes a two-dollar part is a killer. I feel comfortable enough that I'll ride her until I can't repair her anymore, or she can't be repaired any more. No guarantees in life.

 

[Mike Rocket]

I feel we're safe for a reasonable amount of time but sometimes a two-dollar part is a killer. I feel comfortable enough that I'll ride her until I can't repair her anymore, or she can't be repaired any more. No guarantees in life.

Yes, good advice really. Me too, i intend to keep mine. I always use the gears gently in the hope the gearbox stays good.
The Rocket selling prices are still holding high in the UK as all motorcycle prices are so that gives confidence. The spare part costs are frightening though.

Just to go off thread for a moment
It looks like our net zero target from our English government is going to be pushed back further as the electric network they want us to follow is failing at the moment and the battery range they advertise is bull****.
The electric car take up is falling too.
England cannot save the world on it's own as they know. Not without China, Asia and Europe.
It's an English money spinner for them.

So it appears that we will still be able to buy petrol for the foreseeable future. Hopefully non Ethanol E5 which is all i use. Esso E5 is Ethanol free at the moment according to their website.
I hope this small rant isn't too boring for this site.