Wrenching on the XXX-NT w/ .12Picco

[T4EaterJonny]

So I couldn't get it going yesterday... It fired but couldn't stay running. Glow plug was brand new. I ripped off the fuel filter (clean anyway) looked in the carb and decided to clean it. When I went to put the carb back on I noticed a little small o-ring. Does this go on the engine part and gets squished by the carb as you press it down? I'm sure i have it in the right place. I'm not sure where else it would go. I felt something fall in my lap while i was working on it and I didn't see where it fell from.
Also, should the carb be able to spin around after the pinch bolt is tightened? It seems secure, but I don't feel like that's supposed to happen. I don't want to overtighten it and break something. I read somewhere that I should use RTV?

Use Permatex RTV automotive, O2 sensor safe silicone at the carb base around the O-ring and press the carb down while you tighten the pinch bolt

[T4EaterJonny]

Bump.... Is the carb supposed to spin or no? I've got it pretty tight. it doesn't spin easily, but if I turn it pretty firmly it will turn. I really don't want to over tighten it and break something. I usually never let my stuff sit and let crap build up- hence never learning how to clean and take it apart lol.

[Chris K]

Carb is supposed to be stationary and NOT spin.

With that said, you should probably use some RTV (sensor safe) where the carb meets the case - it doesn't take much but my guess is that it will leak since it's obviously not getting super tight. A dab around where you tighten might help a bit too.

Also, be 100% sure that the carb linkage angle is correct before you add the RTV.

Let the RTV set (overnight) and you should be good to go!