Tried to remove the sheared manifold bolt from the head on Sunday morning. It won't budge, so re-assembled. Amy is running REALLY badly. So much work having gone on, it gets hard to figure out what is going on. The obvious source is the recent head rebuild, but good compression implies that has does it's job. I'm not sure what else that really achieves. Good valves, properly adjusted give correct compression. That is that part of the equation?
As Amy has done more miles in the past 2-3 months than over her previous 6 years then other factors may be coming into play.
Decided to check for vacuum leaks, as the symptoms were indicating this as a strong possibility.
Silly mistake... When re-fitting the manifold I hadn't put one of the bolts in properly PLUS I hadn't tightened up properly either!!
So the carb cleaner trick did it's job. Refitted the incorrectly installed bolt, tightened up the others (admittedly one still missing where it was sheared. No vacuum leaks that I can tell and she's running OK again.
Still not quite right. Will use aforementioned carb cleaner to clean up the carb anyway.
Still think the float level is too high, and have to see what I can do about that, as the old Zeniths are not designed to be adjustable. Extra washer under needle valve is my current thought. We'll see.
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