ca. 2001 road bike, Dura Ace 7700 9 spd.
bought bike used in 2005, used very sparingly since (i.e., it has sat dormant a LOT).
Last summer I used it a good amount - 2-3 long weekend rides per month between June and October.
Just pulled it out last month to use for fast paceline laps with a local club. We do 1 hour, with rolling hills, so constant fiddling with both derailleurs...a lot more shifting than I normally do, and I was wearing thick fumbling winter gloves, if that matters...
Anyhoo. I used it once for these laps at the beginning of March, worked fine, as always.
Used it again last week, and it was fine during the laps but while riding gently on the way home I noticed the rear derailleur won't shift outward, to smaller cogs. It still shifts perfectly inward, to larger cogs.
I tried flushing a whole can of WD40 through it (that's freed up wonky MTB trigger shifters for me in the past, a trick I learned here a few years ago)...no change, and the solvent appeared to be flowing quite clean and clear, fwtw.
I then tried putting a good ounce or so of chain lube in, and that did seem to make a difference, just spinning the cranks by hand at the house (holding the rear end of the bike up).
But when I test rode it to work today, it's back to the same problem.
It seems to shift only when I press the little lever in and HOLD it, hard, then release...at which point I then get the audible "clunk" from the brifter, and it shifts to a smaller cog. And that does not always work consistently, it just seems to be the only way to get it to work.
So - should I keep flushing with solvent? Or try degreaser instead?
Or use more lube?
Or is my brifter toast?
Other than trying degreaser or lube, I reckon taking it in to a shop is my only recourse, I am not interested in taking a brifter apart, with my (lack of) mechanical skills...
Thanks for any help...