Yamaha YBR Custom - Slipping cam chain

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

I5s not the engine. I think your problem is at the other end of the tools.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
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cresad · Nova Slayer Joined: 02 Jun 2014 Karma :

Hi

My Daughter has a ybr custom and when I had to change the head due to a different matter I found that if you didn't get the chain on properly the chain misses the bottom sprocket and slips. I ended up pulling the rotator off to make sure the chain was on as you can't see the sprocket otherwise.

Adam

WD Forte · World Chat Champion Joined: 17 Jun 2010 Karma :

NagaNaga · Derestricted Danger Joined: 23 Jun 2024 Karma :

Well its not the tensioner...

The chain is not even on the sprocket at the bottom!!

And even with all the shaking and moving it about its never gone on right...

Well now I have this borescope camera and can see what the crack is, I will hopefully be able to get it on!

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that_impulse_guy · Scooby Slapper Joined: 07 Mar 2023 Karma :

knowing what we know now, and re-reading your initial post, it would be interesting to try work out how the cam chain came to be off the sprocket. Like...did you remove and refit the tensioner which the rocker cover was on? No blame, just trying to work out how it came to be that the thing came off the bottom sprocket but you mention the cam chain is nice and tight in your original post seems to imply the tensioner was also fettled at that point.
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NagaNaga · Derestricted Danger Joined: 23 Jun 2024 Karma :

Sadly the OG noise I was hearing that I went investigating is still there. So no idea what that is yet. But its all working so.. I will just leave it for now.

The new tippy tappy sound is just the rockers/valves. I probably need to re-adjust the valve clearances. Plus it is a new valve.

I will be using the bike to get to and from work till Sunday and Monday when I am off I will give the engine a look over and make sure all is fine.

I have only been to work and back once and its a short trip, About 3 miles each way and the bike ran fine. No issues apart from the odd sounds I already mentioned.

cresad · Nova Slayer Joined: 02 Jun 2014 Karma :

I do know that the one not against the adjuster is clamped between the barrel and the head.

What sort of mileage is on the engine as they're usually fairly resilient.

Adam

NagaNaga · Derestricted Danger Joined: 23 Jun 2024 Karma :

Here is a video showing the sound its making.

https://www.youtube.com/watch?v=4YlcPOMjVO4

I have rechecked the cam chain tension today as well as re-doing the valve clearances.

Still noisy. The bike runs perfect apart from being very tippy tappy.

Cam chain guides are in place and fine also. Had a good look at them when the engine was apart.

The sound is 100% coming from the top of the engine.

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

Is your exhuast blowing? It can sound incredibly like a ticking noise...
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050