strange rattling ONLY when closing throttle

Hello,

My name is Felix from Holland. I have a 1982 KZ750R1.

It has always run well but now I have this strange rattling noise that only occurs when I close the throttle. In idle you hear nothing. Also when accelerating or cruising this noise does not occur.

I have no clue what that may be. Anyone?

thanks in Advance


Felix

Wild guess -- Muffler name plate is loose.

Good Fortune!

I would have a look at the Cam Chain Tensioner... Check them, but a muffler plate or guard would tend to rattle under load or on the side stand as well.

Would also check the drive chain for possible kinks, any (slack) adjustment needed, any lube needed.

Good Fortune!

When at idle in neutral, and revved, is the same rattle heard as the rpm drops back to idle?

In other words, can the rattle be duplicated with the engine running in neutral?

If so, this may make it easier to locate the source of the rattle.

Good Fortune!

Just hang in there... General Patton is going to show you how to Download the Service Manual..

Good Fortune ! ! :blink:

No, the rattle is only under load.
I am quite convinced it is coming from out of the engine , not external parts such as muffler plates...

Sounds like the can chain tensioner is backing out then snapping shut. That is the reason people use the manual tensioners.