[SEL] FM Z 3hp trouble

[ED]

Hello Tom,

I have a 2 HP FMZ and got a new, aluminum, bracket from Hit & Miss, Ed Dies.
I had a problem mounting the type R mag and wound up enlarging the holes in
the needed direction to get everything to fit.

Ed Stoller
New Fairfield, CT


----- Original Message ----- 
From: "Tom Smith" <tsmith at hal-pc.org>
To: "The SEL email discussion list" <sel at lists.stationary-engine.com>
Sent: Wednesday, May 04, 2005 10:39 PM
Subject: [SEL] FM Z 3hp trouble


> 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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