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Hi all, I got my ECU reflashed by VCycleNut and installed a Woolich QS (GP shift) this spring. I've been chasing a small problem ever since.

Upshifts are always spot-on, but downshifts randomly buck. If it's happening it still does with a firm and deliberate throttle-off.

I've checked the APS settings and adjusted it but wasn't able to get my numbers optimal - it was hard to get the WOT and idle numbers to line up. Think I need a new APS?

I had the wee beastie on the track and the QS is amazing! Fortunately on the track day I had zero issues with bucking, just had a blast.

Tire Wheel Cloud Sky Land vehicle
Tire Wheel Cloud Sky Land vehicle
 

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Also be conscious of anything adding a pre-load to the shifter.
Mine will do this too if I'm not deliberate with the shifter. The auto-blip will surge the bike but not enough pressure on the shifter to shift.

Woolich racetools, but not GP shift here.
 
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