Your Motorcycles: BMW
Jacks Nice 1976 R/90S:
Hi....... Thought I'd send
ya a few snap shots of my 76 R/90S that's been in my ownership
for the past seventeen years now. Some of the modifications
include an over bore of .180 using R100 9.5 compression pistons
and I've applied a thermal barrier coating to the piston crowns,
BMW 336 sport cam, lightened the flywheel by almost 3 lbs to
reduce rotating mass to reduce tranmission down shift clunking
along with giving more positive and quicker upshifting but the
most noticeable effect was the engines abilities to rev up
quicker. The heads features include Kibblewhite Black Diamond
stock size valves, intake ports have been epoxy filled to reduce
port volume in order to pick up port velocity do to the oversize
stock ports, combustion chambers along with the valves have also
a thermal barrier coating applied in efforts to obtain lost
energy and some very tricked out seat work. The carburetors are
Mikuni 38mm FlatSlides mounted to a venturis spigot manifolds,
love those flatslides!
The frame has also recieved special treatment to help it track
straighter throught a curve thus giving me more confidence to
push it harder than usual in efforts to keep pace with my
friends. All in all this in one bad and fast old BMW that I
truely enjoy riding and with 103,000 miles registered on the old
odometer, she still turns a few heads.
Jack Hara