Harmon XXV clicking noise

[BobCarp]

Hi there I have a Harmon XXV for 6 years and now it has a quiet clicking noise from the drive chain.
Watching the chain it seems to bind momentarily then clicks and does its thing.
Any body got some advice

 

[jackman]

I've had that problem when the chain is not aligned on the gears. The chain would occasionally ride up on the sprocket and then drop down making a thumping sound. You may want to check that the chain is riding in a straight line on the gears.

 

[Washed-Up]

Take a straight edge long enough to go to the edge of each gear to check the sprocket alignment and adjust accordingly then lube the chain with a synthetic lube.