Has anybody tried using the GYTR tuner on their 450FX yet? I ran into some issues with the tuner showing the message "failure to connect to the ECU" and I'm wondering if anybody else has experienced the same problem. Ultimately I got the tuner to work after a lot of trial and error, summarized below. First I verified that the tuner works on my 2012 450F and it worked fine. I tried disconnecting the battery on the FX. Didn't help. Side note, the battery voltage is 12.7v with the engine off, 14v with the engine on. I then checked continuity of the red, green, white/black wires between the tuner and ECU plugs. Everything was good. Next I tried NI-MH batteries in the tuner which didn't make a difference. I don't think they are necessary anyways since the tuner automatically powers on when plugged in, powered by the bike's battery. I finally found the only way to get the tuner to recognize the ECU is to hook it up, let it power up automatically, start the bike and let it run for a minute or two. At this point you can access the "monitor" fuctions. As usual you can not send a map with the engine running. The tuner will still recognize the ECU for enough time to send a map once you shut the engine off. If I let the bike sit for a half hour or so its back to square one and the tuner will not work again without starting the engine. At the end of the day I'm not sure why the tuner is so temperamental with the FX. I wanted to post my findings in case anybody else runs into the same problem. I was starting to have some bad thoughts last night that the ECU might be toast, or there was an electrical problem that would have warranted taking her back to the dealer.