9 speed chain on 8 speed drivetrain?

dawnophile
dawnophile Posts: 157
edited December 2008 in MTB workshop & tech
My mate was having a problem with his gears skipping, so I took a look. Rear derailleur was indexed properly, but the chain lifted up on the sprocket every couple of revolutions.
Checked the chain and he had a SRAM PC951 (9-speed?) chain with a silver (8-speed) powerlink on an 8 speed cassette.

I didn't think different chain/powerlink combinations would even fit together.

Is this causing the skipping?
And should my mate be angry with the shop that put the chain on?

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