Quote Originally Posted by fullchoke View Post
One casualty in removing the head was breaking off the vacuum connections on a part that screws onto the water jacket on the intake manifold near the front of the engine. They were 2 plastic connections that the vacuum lines attached too. If I can't find a replacement part, or repair this one, can someone tell me the purpose of it, and whether I should cap off these lines or connect them? I'm thinking this activates something heat related at start up. I will get a couple pictures.
It's the thermo-switch for the Mikuni's Axillary Accelerator Pump which supposedly improves drivability when the engine is cold. I disabled it long ago without noticing any issues. You can just cap the source and pump ports and install it as-is to plug the hole. If you want a good used replacement, I have extras. Just let me know.

The valve is open when cold to operate the pump. At ~100* F, it closes rendering the pump inoperable.