Join Date: Nov 2009
Location: Lander, Wyoming
If one uses an empty Visine bottle or something similar to create a vacuum on the fuel tap automatic diaphragm hose or has a manual valve, one could time how long it takes to drain the 5 - 5.5 gallons of normally level accessible fuel like on a flat straight highway.
If fuel flow slows or stops, 1st check that the Visine bottle still has vacuum. Then open fuel cap, if needed.
One could temporarily use empty, clean milk or water jugs to measure time per each gallon. (They are actually larger than a gallon.)
The fuel system needs to flow at least 3 gallons per hour (1.2qt per 6 min) to sustain 30mpg @ 90mph in a head wind. My bike got 35mpg in similar conditions, twice.
Time this once with tap in the ON position & a second time in the Reserve position. (Is there any possible old fuel varnish restricting the internal fuel filter screens?)
Modify at "YOUR OWN RISK"!
Still riding my 1987 KL650-A1. 85,000+ miles & counting
Last edited by pdwestman; 05-15-2019 at 12:06 PM.