In a tight spot

just put on a brand new drive chain (triumphs own) and it has a tight spot. I replaced a 'did' gold chain 'cos this also had a tight spot. i can't be unlucky to get 2 faulty ones sent to me. I 'm I the only person this has happened to? can't load video clip to show so i have put it on my facebook page, (type in my name)

 

thanks all. Checked sprockets teeth they are fine. the eccentric sprocket theory is a worry because it would have to major to cause a hugh deflection in the chain tension, but it's a thought and i will measure the run out. The chain is smooth when you turn the wheel by hand. I have e-mailed the shop wait and see what they say.

 

done run out of sprocket, hub and wheel while i was at it. i know wheel rim does not effect the chain. All three are round. the tight spot does not coincide with the same spot on the wheel because the chain/link will not line up with each revolution due to the length of chain.

 

just uploaded two clips on my facebook page showing the chain deflection when turn wheel by hand and with the motor running, this time i have put a marker on a stick to show better, when the motor is running it is less obvious but it is at low speed when you feel it and when you come to tighten the chain.