2020 Rs Cam Chain Tensioner Question

I've found 675 and 765 can rattle their camchain if left for a while on their sidestand (opposite side to tensioner).

Presumably the oil drains away and the chain initially rattles but it does go away after a minutes running.

Does your continously make a noise or just the first minute after starting?

Resetting the tensioner is easy but it needs removing and doing on the bench, then reinstalling.

Motul is good stuff, and Castrol is not some wonder fluid, so I wouldn't worry about the oil until the miles are up.

 

10/40 to 10/50 would be less pressure as it's less viscous.
If you did change to Castrol then that would eliminate one option but I'd stick with 10/40.

 

Yes there is.
I had to helicoil the casting as someone had stripped one of the x2 M6 bolts on a 675. Take off the rhs crank cover and cable tie a socket into the left hand corner.



Nothing "forced" anywhere as you just pick the socket diameter to snuggly fit before cct removal.

You might need a new gasket.

 

Check out the posting 'Question About Oil Change'. It's an old posting started in August 2021 but recently resurrected with further information. Last month (February 2025) I added information on how to strip the hydraulic cam chain tensioner if you decide to do so.

 

I would guess it woke up, lol.

 

@Gitter If the bike has quietened again i would tend to leave it as is.

 

I had trouble with the Cam Chain Tensioner on my 2020 T100.....tapping when cold for around 2 mins.....started at around 500 mls.

Looked at all sorts to cure it.....did not want to dabble with the Tensioner as its not just a case of unscrewing and refitting.

So be very careful

On the Watercooled bonnie twins you need to lock up both the crank and the camshaft.

reason for that is that once the tension goes off the cam chain it can jump teeth....caused by any valves that are open or part open.....there spring trying to close the.

So its quite involved....if its the same set up....I suspect it will be.

In the end I decided to look at the cam chain tensioner and made the tools req to lock the crank and cam.

I bought a new tensioner before I started the job....on getting the old one out and comparing to the new all looked fine....mainspring same length.

The only thing you cant check is the fixed in oil pressure relief valve.

Resetting the CCT is tricky...the manual and youtube vids are very unclear and in fact poor.....made a vid on how to do it...see link.

To be honest resetting your CCT wont help.....it will just go back to where it was.

So did it cure my tapping....yes and no.....its way better.....but on cold start I can still hear it a bit....but much reduced.

Not sure why the new part sorted it....either the oil pressure relief valve was faulty....or the tolerance on the ratchet slots may vary....so if the spring and oil pressure can make the piston go to the next adjustment slot...it taps,.

Will never know for sure.

But take care.....its a tricky job that sounds simple.

https://www.youtube.com/shorts/GVfwwcrynj4