help rebuild

[cookie]

new to this think iv got a vespa 100 engine well all apart  ser number V9B1M  looked it up it says 1980 vespa 100 hope thats right need list of parts to upgrade to 135 and do i need to upgrade gears clutch ecr any help please .
all the best cookie 

[triffid]

simple way would be dr/polini/malossi iron kit, polini snail or similar exhaust, upgrade primary drive and upjet carb. clutch should handle that but if not sure go for some sport plates and stronger spring.