Chains wear and links tend to stiffen up. Two strokes tend to put more stress on chains for some reason. The constant stretching makes the links tighten up until they virtually seize.....wearing sprockets and also the possibility of breakage! This, of course, is in extreme circumstances.
The only real way to check (if you are unsure..and respectfully you do sound if you have not had too much experience) is to remove the chain. Hang it over the edge of a spanner and pull it round for the complete circumference of the chain. This will show any tight or seized links.
Careful use of a chain splitter can loosen the tight links but if you find any that are really tight/seized then 'buy a new chain'!!
Hope that this helps
Mike
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I don't mind dying...I just don't want to be there when it happens!