Originally Posted by Motorfiets
does it have a tight spot possibly?
Could be... I will check this tomorrow. This is the second build rear wheel, and they both started this, so perhaps, unless by chance they both have a tight spot, I'd like to blame the chain. It gets worse with 2 up..... That's why I tried to go over/under with tension, as it changes a little with second up. It only happens at neutral torque. pull a little power, it goes away... or let go of the throttle a little....It goes away. I have checked with the builder, and they have been awesome, and are stumped as well. It is time for a DID with a master link anyway.