Any chance this is a CA emissions model? Is tank full of gas?
There have been a couple bikes here that the vapor return line started leaking and caused issues.
It is the CA emissions model. Gas tank is 3/4 full
I mucked around some more today, trying to find any spot of wire that had rubbed through (none found), I WD-40'd the SVTA joints and moved the rod back and forth to work it all in there, trying to clean out the moving bits. This might have smoothed out the motion, but did nothing for the problem.
There is no FI code reported. In dealer mode the -C00 is in the middle at no throttle, and goes to the top at 1/3-1/2 throttle, which seems right.
It's starting to seem more and more like either the SVTA motor is no longer strong enough to hold open the valves, there's something wrong with the ECU, or there's a wiring fault somewhere.
I have a friend coming with a '09 Wee tomorrow, and I'll try his ECU.
I'm hesitant to think it's a wiring issue, because there's no FI error code, and I would suspect one would appear with a wiring fault.