Originally Posted by Louge
Vacuum caps crack over time and introduce a difficult to troubleshoot wandering idle.
Katoum, Tip and Louge,
Thanks, guys. This is a detail which I missed in other threads.
I actually looked for bolts at the hardware store and got close. No cigar.
Congrats, nothing like getting in there yourself to learn about your bike!
If you find out what bolt size fits in place of the brass vacuum fittings let me know, right now mine are just capped. Leaving hoses on one side, with caps on *does* make synching much easier though. At least these you can route somewhere convenient, where checking the condition of the caps isn't a huge hassle.