Hesitation / vibration at full throttle
I have a minor problem that is bothering me. I have owned my 2002 919 for a little over a month. It has just rolled over to 39,000 miles. Most of the history of the bike is unknown to me. The guy I bought it from owned it for 2 years but very few miles. He replaced the FPR, fuel pump, and at least 1 injector. Onto the problem:
The bike has a very rough cold start. It's idles fine but when I'm leaving my driveway if feels more like it's running on 3 cylinders, or it's choked. When the bike warms up it has a vibration that can be felt in the engine at 3-4K RPM under more than 1/2 throttle. Full throttle makes it very noticeable. I have replaced a K&N air filter with an OEM. I have replaced the plugs with the OEM NGK. I found a vacuum line that was not installed on the throttle body. When I reinstalled the vacuum line the FI light flashed a code indicating the TPS had a fault. I removed the vampire clip and soldered the wire, someone had previously removed a power commander it appears. All the things I've done to the bike have incrementally improved the running, but the cold start issue and stumble at WOT are still there.
I plan to do a valve check / adjustment this winter. Any ideas in the mean time? Tomorrow I'll probably pull the gas tank, trace the vacuum lines, as well as pulling the pump assembly out and giving it a visual. I also intend to check the FPR vacuum lines for gas.