Submitted by dave on Tue, 03/04/2008 - 9:52pm

My Kawasaki Vulcan Drifter 1500 motorcycle has run "rich" since the day I picked it up. Since it is a fuel injected engine, I didn't think there was anything I could change without installing an after market computer - but I was wrong. A bit of digging around on the
Gadget website (a wealth of Kawasaki cruiser info) provided the trick on adjusting the Throttle Position Sensor (TPS) which would adjust the mixture.

While most Kawasaki riders were concerned with a too-lean mixture, I was always smelling of raw gas. It took a while to find all of the tools to perform the modification, but I think I managed to get it right. Now the exhaust smells more like a school bus than raw gasoline and it idles smoother too! Thanks to Gadget for the website and Wayne for the multimeter!
For any Vulcan riders who are curious about the changes:
Factory Idle: .644 volts Or 0.04 volts above the maintenance manual maximum.
Updated Idle: .594 volts
Factory Wide Open Throttle: 4.49 volts
Updated Wide Open Throttle: 4.44 volts