[SEL] FM Z 3hp trouble
Tom Smith
tsmith at hal-pc.org
Wed May 4 19:39:07 PDT 2005
Hi List,
I'm a newbie and have run across a problem with a FM Z 3hp engine. I have
restored the once very stuck engine and couldn't find a replacement for the
busted pot metal gov. housing/mag base. I was able to locate a earlier cast
iron unit but then found I couldn't use the Fairbanks "R" mag without some
fairly heavy modification to the base. I then bought a Bosch mag thinking my
worries were over. It mounts fine but when I got the timing right on the
exhaust (per the manual), the little stud that trips the mag appears to be
firing the mag near bottom dead center.
I transferred the gear marks to cam relationship from the replaced set and
the valve timing appears to be on the screws so I can't figure why the mag
timing is wrong. Its almost like I have to rotate the mag timing gear
relative to the cam to get the spark timing right. The manual assumes I'm
running the later R mag and doesn't give spark timing numbers (only
alignment position of the gear tooth marks). If I have to jack with the
timing relative to the exhaust cam, it looks like it may be a bit of trial
and error (mostly error).
What gives?? Any help greatly appreciated.
Tom
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