I recently swapped out the 950 engine for a 2012 990 adventure engine. That year has the larger Super Duke 990 cams it. Got the 990 engine buttoned up last week and worked out a few bugs since. Got it to the dyno today and it did about 10% better than the last time I had the 950 dynoed. Same dyno at the same shop as last time. 2 years difference. I wish I had come in and had it run in the last months before I swapped the engines. It would have been good to see what the HP had gone down to. It didn't feel as good as it used to. I left the jetting the same to see how it would do. I definitely need to get a touch richer in the middle to upper range. I would love to think that it will make a few more HP when I do that, But I know my luck. The old adage that it will never feel as fast as it does right before you melt a piston. I did have to go to 5 turns out on the flex jets where as I used to be about 2.5 turns with the 950. Mods are: 990 in a 950 Q4 slip-ons. emissions all gone. Rottweiler intake. Jetting is: 165 front 170 rear 45 pilot Factory Pro needle at 4th clip notch. 5 turns out on the flex jets. Any insight into what my best avenue to lower the AFR would be nice. Sadly the Tachometer pickup cable wasn't working this time so they did the graph in MPH not RPM. The last time it was RPM so the graphs aren't laid over each other well. Annoying, but what can ya do? The redline is the same for both lines so try to imagine it that way.