Posted by spiffy1 on April 20, 2009 at 20:40:39 from (70.41.137.72):
That mag swap (a rebuilt from Mark's Magnetos) was definitely the biggest improvement [in fact, even started on the first crank tonight, but I did have it running for a bit a half hour earlier] with that 22-36 running rough.
However, it still gets a slight miss [which of course, ignites in the manifold], more likely when warm, but I won't say only warm. Doesn't seem to matter anywhere in the RPM range, but sometimes more or less throttle does seem to get it on track for a bit.
I did isolate it to #3 once [went completely dead, plug good and wet], so I'm thinking a sticky valve(s) rather than carb, but suppose it's possible for a cylinder to flood out and the rest run fine. The head had 3new valves, and 8 new guides.
At 1100RPM - except for the miss - it's pretty happy at 20 advance [probably get to 25 degrees if I take the slop out of the linkage - I'm on, or barely after, TDC with the impulse], but, like throttle, spark advance makes a temporary difference if at all.
10 to 15 [even at 20 it doesn't backfire from early spark] advance at idle around 400. I did get it set closer to a slow idle, but I'm somehow convinced [I'd be equally happy to be wrong or right on that :? ] the R carburator's idle setup just doesn't like the Heisler governor (I can get it down to 300 by hand, mimicing the orginal throttle linkage) unless you don't mind the first half of the throttle range being dead; regardless that's not really an issue. Like full RPMs it sometimes just wants to miss here and there.
Don't know why this thing wants to perplex me so much; it sounds so healthy otherwise.
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