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vacuum line locations

S QUINTIN

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Just picked up a 78 750 Hondamatic for me and the wife to ride.
The carbs were off the bike when i picked it up(cheep) So i did a rebuild of the carbs put then back on and now i don't know where one the vacuum lines go?I have the fuel line and the vacuum line:banghead: going to the throttle opener but there's one more one the same carb and that's the one i can't find a home for.
 
CARB PHOTO

Picture 479.jpgHope this will help if i had to guess i say it goes to the air box but i don't see a inlet for it.
Thanks shawn
 
That is the the float bowl vent. Just run a tube back behind the motor but leave the end open to vent pressure from the carbs.
 
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