All the update did was change the needed throttle input from 1/4 turn to 1/8 turn. Before my dealer just did it during a service, I never experienced a problem, and I have huge elevation changes here. I still don't understand how some of you ride far enough up a mountain to cause air sampling issues, without turning the throttle 1/4 turn.
It's not going up, it's going downhill that causes the issue for me - I ride some roads where you can drop a few thousand feet steeply enough to never go over 1/4 throttle. This makes the bike go crazy lean - since the bike runs lean anyway, it goes into a lean misfire.I really noticed this riding in California this summer. Even if you did go uphill at low throttle, the ability of the engine to handle a rich mixture is much better than a lean one.
Over a two week trip through the CA mountains, I did try a few things:
1) blipping the throttle occasionally to >50% with the clutch pulled in
2) hitting the kill switch and holding the throttle WFO while coasting downhill every few minutes
What I found was that once the bike started running badly, neither of these actions would fix the issue. Only a key off restart would fix it; but if I did one of these two occasionally before the issue was noticeable, the problem wouldn't appear. I suspect that once it started misbehaving, it had already run off the map and couldn't correct itself. A friend (and member here) reported exactly the same behavior on his 2007 in Colorado. YMMV
Canadians were covered by this bulletin as far back as 2009, Attached is a link to an old thread where several Canucks had different stories from their dealers. but most got the updated ECU.
Yet at the top of this page, BramFrank had his dealer and Yamaha insist there was no such bulletin in 2011.....As I said, my friend (and PO of my bike) may have complained and got the same answer as BamFrank but AFAIK, he never noticed the problem. Considering how cautious a rider he was, I doubt he was always over 25% throttle. We once got passed uphill in the mountains by a Westphalia camper when he was leading!
I actually wondered if the Canadian bikes just didn't have the issue because the ECU is a different part - but Yamaha Canada obviously did the "Don't ask, don't tell" approach. With the info provided by ERS and my description of the symptoms, they acknowledged the issue immediately - but of course, now they are off the hook financially.