[Farmall] cub j4 magneto

[Dave Maynard]

When you here the second trip f the mag when its on the timing mark the
engine has turned 360 degrees and the mag has turned 180. At this point the
#1 cyl is finishing it's exhaust stroke and not supposed to fire. If you
check the rotor position however, you will see that it points to a diiferent
cyl that has just come up on compression stroke. When the engine is at 180
the other two cyl's are firing, 1 each complete revolution of the engine.
The mag actually fires every 90 degrees of its rotation as it and
distributors turn 1/2 the speed of the engine as does the cam which drives
it. Jim is correct and what your observing is the way it's supposed to be.

On Mon, Jul 12, 2010 at 7:52 PM, WALTER AVERY <waltavery at embarqmail.com>wrote:

> thanks Jim, I can rest at ease, Walt
> ----- Original Message -----
> From: Jim Becker <jim.becker at verizon.net>
> To: Farmall/IHC mailing list <farmall at lists.antique-tractor.com>
>  Sent: Mon, 12 Jul 2010 18:36:48 -0400 (EDT)
> Subject: Re: [Farmall] cub j4 magneto
>
> The impulse should click each time a cylinder is supposed to fire.  In
> other
> words, it should click every 180 degrees.  I can't speak to the specific
> video you watched, but there are some out there that are slightly worse
> than
> getting no instruction at all.
> Jim Becker
>
> --------------------------------------------------
> From: "WALTER AVERY" <waltavery at embarqmail.com>
> Sent: Monday, July 12, 2010 4:02 PM
> To: "Farmall/IHC mailing list" <farmall at lists.antique-tractor.com>
> Subject: Re: [Farmall] cub j4 magneto
>
> > my cub started right up after replacing the coil following your
> > instructions. thanks
> >
> > i hear the impulse mechanism click on the timing mark and also at 180
> > degrees later. is this ok? i never listened close before to know if it
> did
> > this before i removed it.  i watched a video somewhere that stated, "you
> > should not hear another click or the governor is out of time". can
> someone
> > enlighten me on this? thanks, Walt
> > ----- Original Message -----
> > From: Bob Schleyer <madmapper2 at verizon.net>
> > To: 'Farmall/IHC mailing list' <farmall at lists.antique-tractor.com>
> > Sent: Fri, 9 Jul 2010 19:36:29 -0400 (EDT)
> > Subject: Re: [Farmall] cub j4 magneto
> >
> > Bring # 1 cylinder to the top of it's compression stroke.
> > The rotor should line up with the # 1 spark plug wire.
> > Take the magneto out and rotate it 180 degrees, put it back in and try to
> > start it.
> > If it is out of timing it can only be 180 dgrees out.
> >
> > -----Original Message-----
> > From: farmall-bounces at lists.antique-tractor.com
> > [mailto:farmall-bounces at lists.antique-tractor.com] On Behalf Of WALTER
> > AVERY
> > Sent: Friday, July 09, 2010 2:06 PM
> > To: Farmall/IHC mailing list
> > Subject: Re: [Farmall] cub j4 magneto
> >
> > murphy's law has struck me again.
> > i tried to do as directed but must have bumped the mag
> > and made it move.
> >
> > it is harder now to turn over and on one try, it refused to crank.
> >
> > the battery was just freshly charged.
> >
> > it seems like the impulse mechanism is making more noise. i didn't use to
> > hear it when starting with the starting motor.
> >
> > i guess she's out of time
> >
> > i think she would prefer a professional's touch.
> > ----- Original Message -----
> > From: Jim Becker <jim.becker at verizon.net>
> > To: Farmall/IHC mailing list <farmall at lists.antique-tractor.com>
> > Sent: Wed, 7 Jul 2010 23:57:36 -0400 (EDT)
> > Subject: Re: [Farmall] cub j4 magneto
> >
> > Do EXACTLY as John said and your timing will end up right back where it
> is
> > now.  Don't take any shortcuts.
> > Jim Becker
> >
> > --------------------------------------------------
> > From: "john hall" <jtchall at nc.rr.com>
> > Sent: Wednesday, July 07, 2010 9:34 PM
> > To: "Farmall/IHC mailing list" <farmall at lists.antique-tractor.com>
> > Subject: Re: [Farmall] cub j4 magneto
> >
> >> Assuming you'll pull the mag off, fix it an put it right back on here is
> >> what I would do. Hand crank the engine and stop just as soon as you hear
> >> the
> >> impulse click. Pull the cap and mark where the rotor is relative to the
> >> mag.
> >> Then make two precise marks to show alignment between the magneto frame
> >> and
> >> the engine. Pull the mag and fix it, line up the rotor, line up the
> >> magneto
> >> to the engine and you are ready to go.
> >> There are only two rules:
> >> 1) make sure the marks are something you can see and that won't wipe
> off.
> >> 2) do not turn the engine.
> >>
> >> For safety's sake I try not to hand crank an engine that has had the mag
> >> removed until I know it is in time. Use the starter or tow it.
> >>
> >> John Hall
>
>
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