big rattle at idle (movie)

[BSM2]

Hi,

I have a big rattle at idle.
bike 2014 and 40hours old.

https://www.youtube.com/watch?v=vLdpz8u-qMY

Any suggestions?
I think a bearing or powervalve?

[Jakobi]

I imagine a bearing would probably rattle up even more and begin to knock as rpm increases, but could be wrong.

What have you done to try and isolate the cause?

Apply pressure to the pipe in different ways to see if it changes.
Remove the bash plate.
Check the carb, frame, plastics etc to see if it's something making contact. Rad shrouds can vibe against things sometimes and cause strange noises too.
Remove RHS PV cover, refit the pipe and check if the sound occurs at a given PV position. Check tension on the plate. Consider removing RHS cover and checking for contact against the cases from the linkages.
If you do that, check the mains on that side for play.
Remove flywheel cover and check that side as well.

You'll have to do some digging probably, but start with the easy ones and go from there.

[Stoby]

Check all your engine mounts . Some of my bikes i've had to install lockwashers
to keep em tight
Stoby

[BSM2]

Hmm see pics.

Explenation from our expert:
Factory clearencs diameter cilinder/piston to tight. In combinatie with poor fuel economy, the piston overheated.
After overheating the piston shrinked 0.2mm!! And that was the sound of a piston with to much play.

Stopped riding at the right time.
New piston installed and the beast is alive again!
Know with the right clearence!

[swazi_matt]

Originally Posted by BSM2

Hmm see pics.

Explenation from our expert:
Factory clearencs diameter cilinder/piston to tight. In combinatie with poor fuel economy, the piston overheated.
After overheating the piston shrinked 0.2mm!! And that was the sound of a piston with to much play.

Stopped riding at the right time.
New piston installed and the beast is alive again!
Know with the right clearence!

Are you sure you got to it in time??