Topic: Chain rattling when clutch grabbed? CB550K 76

[gregripko]

Noticed sometimes there's a rattle sound around the front sprocket area when i coast with the clutch pulled/grabbed fully. Chain worn out? Clutch plates?

[Raul CB750K1]

Loose chain maybe. When the engine is pulling, top half of the chain is in tension, and bottom half is hanging. When you pull the clutch, bottom half is in tension, and top half if loose, rattling on the swingarm.

[gregripko]

My chain stretches quickly... Guessing this isn't too normal... Any advice? Noticed the front sprocket has a little play as well... Like a loose tooth..

[TwoTired]

The front sprocket is fine with a loose fit on the spline shaft.
The sprocket cover has a steel chain guide in it, and the mount can break, allowing it to contact the chain.
A bad front sprocket, dry chain, or worn chain, can make the chain climb worn sprocket teeth, and contact the steel chain guide, which shortly thereafter breaks one of the steel guide mount points.

Or, it could be that the chain is so loose that it slaps or grinds on the chain guard during deceleration.

Have you adjusted the chain tension?  Was there weight upon the seat when you did?  Have you rotated the rear wheel to search for tight spots in the chain?  Is the chain properly lubricated?  Do you have a center stand?

[gregripko]

Wasn't weight on bike when tightening chain... I lubricate it and it seems to clang more when two people are on it...i have the center stand....if it's tight in certain spots what can i do?

[TwoTired]

Wasn't weight on bike when tightening chain...

There should be.  The geometry of the swing arm causes the chain to tighten as the suspension compresses.

I lubricate it and it seems to clang more when two people are on it...i have the center stand....if it's tight in certain spots what can i do?

Replace the chain.  If a new one does it too, then sprockets.  Next would be swing arm bushings or rear wheel bearings.