I bought a 98 EV in Denver Colorado. I rode it over the mountains to a Rally. it would bog down going up the hills.
Since I had to ride all the way back to Vancouver BC I figured I'd better do something about it or I'd never get home.
I finally figured out the fuel filter was so plugged up the fuel couldn't get to the injectors.
I took the filter off and back flushed out nearly a cup full of rust, after that the bike ran flawlessly all the way home and until I sold it.
Another problem I had with the bike, it was fitted with the crappy carbon core spark leads, this caused it to miss on one cylinder,
new copper core leads fixed that problem.