Sounds like a Rattling camchain....

[haydw]

This applies to one of our blood bike 1200RTs but as its the same motor thought would post this here.

It's had what sounds like a rattling camchain on the overrun for a while. It's gone in to the local BMW dealer and had both tensioners changed plus and oil and filter change but it appears this hasn't really solved the problem.

For some reason they are a bit stumped as to what else it could be, little ends have been mentioned but from experience with two strokes it really does sound like a flapping camchain. The last thing we want to do as a charity is pay huge labour bills when it can't be defined what the exact problem is.

It only does it on the overrun but not all the time. Power is fine, it runs ok but is bloody irritating

Any other suggestions as to what to try next?

 

[Magwych]

There are 3 chains and tensioners... There is another one behind the front engine that drives the transfer shaft. A few cases of noisy cam chains on ADVRider wree tracked back to that front timing chain and its tensioner.

 

[flatdog]

How much play is there at the rear wheel with it in gear - rotating the wheel forward and back - rather than side to side.
It may be the transmission rattling as the throttle is slacked off?
How many miles?
For clarity it is a 4 stroke. (or did you mean 2 cylinder)
Compression tested?

 

[BlueBird]

does it sound like its coming from the right cylinder?

I have a cam chainey type rattle also, tried the usual like you have.

 

[Bendy toy]

Mine rattles n neutral with clutch released. The rattle stops when I pull the clutch lever. It makes the same noise if I select neutral when when rolling along. I'm told its gearbox input shaft end float; essentially harmless, but annoying nonetheless.

 

[Steptoe]

This applies to one of our blood bike 1200RTs but as its the same motor thought would post this here.

It's had what sounds like a rattling camchain on the overrun for a while. It's gone in to the local BMW dealer and had both tensioners changed plus and oil and filter change but it appears this hasn't really solved the problem.

For some reason they are a bit stumped as to what else it could be, little ends have been mentioned but from experience with two strokes it really does sound like a flapping camchain. The last thing we want to do as a charity is pay huge labour bills when it can't be defined what the exact problem is.

It only does it on the overrun but not all the time. Power is fine, it runs ok but is bloody irritating

Any other suggestions as to what to try next?

Are the cam chain guides all still in one piece ?.

 

[haydw]

Good question. Will get them to check. Would explain new tensioner but not tensioning in the correct way. Presume you wouldn't be able to spot that without taking the head off?


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