gpx vacuum ports

[srxwayne]

any body know why 338 gpx has 2 vacuum ports in the crank case?

 

[Yamaha Nutz]

all gpx's 338 or 433 have 2 pulse line tubes one for each card wch was a kehnin cd or cdx which where diaphram carbs if running mikunis just plug one unless you want to run 2 single fuel pumps