Hi, does anybody know if changing the rear sprocket size would make the quickshifter faulty? Ive gone up 2 teeth on the rear sprocket checked the chain tension, and done a tyre calibration run through. Up shifts work fine, but down shifts are non existent. Not sure if its changing the sprocket thats done this or a re-map thats lost the functionality- wanted to ask if it was something obvious before i uninstall and re- install the map. Ta.R
Sounds exactly like my Diavel. Upshifts fine, no downshifts. All I'd had done was fitting a full Termi system and a custom map (Termi upmap was crap). It worked for a while afterwards then stopped working on the downshifts. I have to uncouple the QS to remove the front sprocket cover for cleaning so I wondered whether I hadn't refitted it in exactly the right position. Tried ifddling with that but it didn't make any difference and as it sometimes made a half-hearted attempt to change it was landing me in alarming false neutrals. So I disabled it in rider settings. M&S in Newcastle said Ducati QS units of this vintage (2020) weren't very reliable and if I really wanted one i'd be better off with a Translogic. I can't be bothered.
I had the same downshift problems appear on my 2018 1260 in Spain. Tried recalibrating etc but it didn't help. Cured the problem with a second hand quickshfter lever from ebay. I too have the very useful 42 tooth rear sprocket but that wasn't the problem. If you have a look inside the lever sensor it is rather simple - a couple of microswitches and a springloaded bar. I read somewhere on here of someone who repaired theirs by replacing the microswitches.
That's interesting, if that's the case i can do a quick test and repair if necessary. I assumed that it was strain gauges and something more complicated
So did I. I'd heard of a Hall Effect switch and thought it might be something like that, but it isn't.The little yellow pins operate the microswitches and are triggered by the metal pin in the second picture.
I read somewhere that going beyond 42T rear, or 14T front sprocket, and I think the calibration goes out of range. So you should be OK as you are and the issue lies elsewhere.
Thanks for that. And everybone else. At least I'm narrowing it down.looks like its more likely to be a sensor than a map, or the sprocket
So finally found a dry day to try and sort this, Changed sprocket back to 40T reset the tyre calibration amd it works fine. Just wont work with 42t i do have the ability to do a gearbox adaption reset, is that worth looking into, as i do like the feel of a 42, compared to the 40T
Odd, because 14/40 is a slightly bigger ratio change than 15/42 and yet on both my 1260s the speedo calibration recalibrated and the DQS works.
I’m curious to understand why a change in rear sprocket size would affect functionality of the QS. I’m not questioning for one moment peoples lived experiences Im just curious as to why it has an affect. The QS is a simple on/off switch which cuts the spark for a few microseconds, enough to reduce the torque applied at the gearbox such that clutchless gear changes can be made. Tyre calibration and (when necessary) gear calibration teach the chassis control module, aka the BBS, the relationship between road speed, engine revs and gear selected so that if the BBS has to intervene and activate one, or more, of the rider aids, ie, DTC, DWC, ABS, cornering ABS, it knows how much to intervene by safely. I accept that if the rear/front sprocket gearing ratio is altered beyond a certain point then the road speed in relation to engine revs in relation to gear selected will fall outside of the table of parameters within the map in the BBS and cause the rider aids (bar ABS) to be deactivated, but the QS is not part of that equation - or is it??
