New Dura-Ace shifting problems
I have just put together my first high end racer (Litespeed Vortex frame, American Classic 350 sprint clinchers, Alpha Q Sub fork, Ritchey WCS stem & bars) and have Dura Ace 9 speed, with Ultegra bottom bracket and cassette. At first everything was fine on my inauguratory ride and it was a joy, then after about 60 miles the rear began jumping after certain shifts. There is always at least one sprocket the chain (which yes is Dura Ace 9 speed) does not run onto comfortably, usually slipping to the neighbouring sprocket or just skips straight over. This happens either direction so I can't figure it as the cable being too tight or loose. Also the largest sprocket cannot be reached unless I'm holding my finger on the shifter, and this seems to happen because when the shifter is pushed to this position there is no click from it reaching another indexed point, although conversely when on the smallest sprocket you can click the shifter onto one more point (although it doesn't shift the derailleur due to the end stop). This makes me think the whole indexing has been thrown out of whack, but how? Could it be from having accidentally made one shift beyond the smallest sprocket bringing the whole alignment over? Or from the new gear cable stretching? The components are second hand, but there is not much use on them, chain and cassette both still showing some of that original shine.
I have spent ages tightening and loosening on the barrel and fine adjuster, and checked the end stops (yes the derailleur can reach largest sprocket fine) all to no avail - this adjusting simply changes which sprocket the problem is at.
I have heard Dura Ace can be quite fiddly, requires very precise and minute adjustments to get it right, or should I say "dialled" (although I must confess I am not exactly sure what this word refers to exactly). Can anyone offer any advice? It is an absolutely beautiful ride and this is rather tarnishing it.
Thanks - Colin