Hi, trying to sync the carbs on my 99', and I see the little screw to remove for vacuum on the front cylinder, but where can I get a nipple to attach the hose to? is it a 5mm or 6mm? Any help as to how to get a front vacuum reading would be helpful.

 

search on sync carbs, may even be in knowledge base articles. Not hard, I believe its a 5mm nipple. most synch tools come with attachments. most here have taken the time to set up a tube that can be easily blocked off but that exits in a convenient location: and a t-couple to the rear cylinder - then its a simple matter of hooking up a synch tool.

 

order it from motion pro. they make on you can permanently install for $7.

 

or just by it from Honda (Ron Ayers)
P\N 16214-MB0-000 for 2.99