After two recent trips to the mountains in my 90 Syncro I noticed the
engine has experienced trouble starting at high altitude (5000- 7000
ft.) I have to give it some throttle and it will start. A bit rough
until warm-up then runs fine after that. Sometimes stalls if I take my
foot off the pedal. When I get back to sea level it always starts right
up without touching the throttle.

Anybody know what would cause that to happen?

Keith O.
84 Westy "Brownie"
90 Westy Syncro