[scouthead]

My '76 2f has been idling a little rough the last couple days, so I got under the hood last night. I was going to adjust the carb, but checked the timing first... off by at least 4-5 degrees...the hold down clamp is tight. It is a vacuum retard distribulater, but there is something wrong with my vacuum switching valve, and it never retards the timing. I can disconnect the hose and suck through it and the timing gets even more retarded. This is the second time in 3 months this has happened. I thought maybe I was just being a wus and not tightening the clamp enough...so I reset the timing and gave the clamp a little more...and the head broke off the little 8mm bastard. I know the clamp was tight. So why does the timiing keep changing??!!
I don't want to have to keep checking the timing every couple of days! W.T.F.??!!

[grant5127]

Need to make sure the vacuum and mechanical advance mechanisms are working properly and check distributor shaft and lobe wear........

[Poser]

Pull the distributor cap and look at the cap and rotor....

Is there any scuffing from the rotor hitting the wire posts in the cap?

[scouthead]

I just had the distributer apart not long ago, everything looked fine- cap and rotor are new(well almost new). I'll check again though.