using a gps i determined that my 2.1L runs at about 66 mph at 4,000 RPM.
I would like to be able to go faster since the speed limits on the
interstates near me are 75 mph?  what speed does the Manual 4 speed 2.1L
do at 4,000 rpm?  Anyone ever heard of switching from AT to manual?  Can
bigger gears be installed in the AT to give a higher ground speed?

Thanks,
Andrew Fox
86 Westy 2.1L