<VV> rebuilding turbo carbs

[Crawford Rose]

Dave, if you don't know, there are a bunch of guys rebuilding those YH carbs 
already! Anyway, the Corsa Tech Guide is the best resource information about 
the part numbers from each year and for adapting/jetting a 65-66 YH to your 
63 Spyder.  If you run one as is, you'll find it a lean, back-firing mess. 
Blackhawk Machine and Steve Goodman can help you with needles and jets to 
fine tune a YH between an early and late engine/turbo.
Crawford Rose