What Is This Thing Called, Love?

What kind of motorcycle?

 

https://www.worldoftriumph.com/collections/100074624-0-2?type=bonneville-t120-black

Part 10?

Triumph part # T1268666

 

I think it is to keep that threaded hole blocked off.

 

I’ll have to look at mine honestly, I’ve not noticed

 

I've a couple of them (or not..) on the speed triple rs engine also.
A bit weird.

 

No part 10 is a PLUG to plug the hole, Ours is not to reason why, the manufacture has decreed that a plug should go there, it may be of use on another model but has no detrimental effect on your bike so simply plug it and ride, speak to your local Triumph dealer things like that on other machines where like level plugs for oil or as you say some sort of sensor but the parts list kindly shown by @Callumity simply show's a PLUG

 

Actually came across someone wanting to know what that bolt was for on the Thruxton facebook page as it was missing from their brand new Thruxton. A few folks commented that it was a common problem for it to go missing and that it's 'blind'. It also mentions that in some casings it's a plastic 'dummy' bolt and in one comment a fellow says it was intended for access to adjust the rear balancer shaft. Take your pick from that but the consensus anyway is that it's purely cosmetic.

 

Quick! @covid-21 has sussed out the secret operations at the Triumph factory. He must be asked to be quiet about it or he will make the manager cry.

To be honest though folks all toiling away doing pointless jobs in a surreal conglomeration of madness pretty much sums up life on Earth!

 

You can find lots of these threaded holes in machinery. They are mounting holes for frames / machinery used during manufacture. They are usually placed so that they can be utilised to hold components further down the assembly line. Some cannot be used for that and end up with a bolt or grub screw to hide them.

 

You learn something new every day on this forum

 

@covid-21 I have found the answer! (and I don't even own a 1200 powered trumpet) It is indeed a cover for access to an allen bolt which allows you to adjust the rear balancer dead shaft. You can see it here http://thruxton.sobell.net/ then go to the index and select balancer- balancer shafts dynamic adjustment

 

If there's a hole in the casing someone should look into it.

 

Send for Plug



The Bash Street Kids won’t miss him......

 

A lot of them are for machines to be able to manipulate / hold castings during manufacture. If they are designed properly they are utilised for other purposes further along during the build, looks like this is being used to access an adjustment screw, can you see the adjuster inside it?

 

If you follow the link I posted above and then go to balancer/balancer shafts dynamic adjustment and scroll down you will see the layout. The Rear Balancer shaft protrudes (with sealing rings) into a pocket in the left engine cover which is covered with the 'bolt' in question which is described as the 'clutch cover plug'. You undo a locking screw on the other end of the shaft which is found hidden down inside the right hand side of the engine below the oil filler cap and then adjust the adjuster screw hidden under the 'Clutch cover plug' to adjust the rear balancer shaft.