Bill,
While I don't know that system directly, I have a guess(es). You didn't
mention what arrangement there is for a capacitor(s) or what is called the
condensor. Generally, these will cause hard starting and poor running at low
RPM.
My guess is that one condensor is involved and may do fine with 3 cyl's
operating, but craps out on full load.
I don't suspect the coil as it is doing fine and unless there is some weird
schematic using dual circuitry, it should be fine for 1/2 or full operation.
Either component should be easy enought to change out for testing (one thing
at a time).
Now, a further possibility is in the dizzy cap. The type that have a spring
loaded center carbon can also give the symptoms...or there is little
resistance between the 6 contacts (thus using every other one is not causing
arching,
but does when you are firing every adjacent HT wire.
While you're at it, check to see that the dizzy shaft is not slopping around
due to shot bearings. This will raise caine with points (altho I don't think
that is the problem here)
And finally, I have heard that poor or improperly routed HT wires can cause
induction crosses. Seperating the wires or using new ones for test is the
diagnostic here.
When thinking about where in the above to start, think about how this problem
came about. If the history is known and the problem started in conjunction
with a proceedure, look at that. What were the circumstances when it last ran
fine.
John Carey
San Jose, CA
keeper of "Gen" (1929 RR 20 HP- GEN 36)
Auto Web Sites I do:
http://www.rrocncr.org/
http://pages.sbcglobal.net/jbcarey/index.html
http://www.rroc.org/worldtour/
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