Honda CB125t clicking noise

Hi,
Was wondering if anyone can help. I was riding my Honda CB125T when
it suddenly just stalled. When i restarted it there apears to be a
clicking noise coming from the engine block and i can't get the bike
to accelerate to high revs. Any ideas?

 

Thanks Rick,
Think i will take it to my local shop to get that one sorted but at
least i know what the problem is now.
Cheers
Dave

 

Um, to supplant what Rick said:

These bikes have a semi automatic tensioner - if we're talking about
the 1980s CB125T, anyway. You *don't* touch the bolt at all. It's at
the back of the block, and has a locknut on it. You set the engine to
TDC on the right-hand pot, undo the locknut, and re-tighten it. If you
fiddle with the main bolt, you run the risk of damaging something
permanently.

Agree with Rick that it might have jumped a tooth. Very rare event,
though.