Chain question

My 00 sm610e failed mot tonight for excessive wear. I said to the guy I could adjust the chain up and he said no adjusting it wouldn't do as he could almost uncover a tooth at the 3 o'clock position on the rear sprocket. Was he talking shit or would adjusting the chain not take up the slack there is plenty of room for adjustment. Also if this is the case where's best in the uk for a chain and sprockets?

Thanks

Not about taking up slack. About how the links fit in the teeth of the sprockets. Since the links/pins should seat well in the troughs of the sprockets and be close without binding to the teeth, pulling the chain straight back and exposing the teeth, as described, exposes a worn and no longer serviceable chain, and most important is to replace chain and both sprockets. Sure you could adjust and run but it's in self destruct mode and you may drop the chain or something else in short order.

Cheers. New chain and sprockets it is then. Know anywhere good to buy one in the uk?

Got sprockets and a chain. Silly question but which way should the raised face on the front sprocket sit? In or out? I stupidly never looked at the old one before I took it off.

This way?
Or this way?

Raised faces in.

.

Should. You should also be able to tell by looking at the plane of the sprocket in relation to the "tracks" on the top chain slider...placed on one way and it should appear "in-line" w/ the chain and if flipped around the other way it should be pretty obviously out of line w/ the chain tracks.

Thanks. I couldn't see much difference either way it sumtill looked in line with the rear sprocket. Going by what u say I have it on backwards :-( chain off again.