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The flywheel key! I didn't think of that - will check tomorrow. Tehn new
plug, then coil.
You guys are the best!
On Wed, Jul 2, 2025 at 2:31=E2=80=AFPM Jeff Scarbrough <fishplate@gmail.com=
> wrote:
> I've got a puzzle...
>
> tl;dr - should I try the plug first, skip ahead and replace the coil, or
> is there something else I should try?
>
> The patient is a Snapper rear-engine riding mower, a machine that's as
> simple as can be. Powered by a B&S Intek 12.5 HP engine, another simple
> machine.
>
> My friend was cutting his grass and managed to get the grass chute tangle=
d
> up in some old fencing. He got it loose, and continued to mow. After a
> short distance, the mower quit running and would not restart.
>
> I brought it into my shop and we started troubleshooting. I first tried
> ether - it seemed like it tried for a second, and then nothing. Pulled t=
he
> plug and it looked wet. Turned the engine over with the plug connected a=
nd
> grounded, and observed a spark. Not a magnificent spark, but a spark.
>
> Verified compression, but due to the position of the muffler, I could not
> get *any* of my compression testers to seal in the hole well. But it
> pushed against my finger with some force.
>
> Moved to the carb. Pulled and inspected. Float working, jet clear.
>
> Put it all back together, and nothing.
>
> Pulled the ground wire off the magneto coil and no change.
>
> So, I'm thinking weak coil. Not completely dead, but not working under
> cylinder pressure. Something else I read suggested a bad plug - this one
> was installed a month ago and has been working. Date code on the engine
> indicates it was built on April Fools Day, 2008.
>
> In the era of $15 lawn mower coils, I would throw one on with no qualms.
> But at $40 or $50, I hesitate.
>
> So, tl;dr - should I try the plug first, skip ahead and replace the coil=
,
> or is there something else I should try?
>
>
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<div dir=3D"ltr">The flywheel key!=C2=A0 I didn't think of that - will =
check tomorrow.=C2=A0 Tehn new plug, then coil.=C2=A0<div><br></div><div>Yo=
u guys are the best!=C2=A0=C2=A0</div></div><br><div class=3D"gmail_quote g=
mail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Jul 2, =
2025 at 2:31=E2=80=AFPM Jeff Scarbrough <<a href=3D"mailto:fishplate@gma=
il.com">fishplate@gmail.com</a>> wrote:<br></div><blockquote class=3D"gm=
ail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,=
204,204);padding-left:1ex"><div dir=3D"ltr">I've got a puzzle...<div><b=
r></div><div>=C2=A0tl;dr - should I try the plug first, skip ahead and repl=
ace the coil, or is there something else I should try?<br><br>The patient i=
s a Snapper rear-engine riding mower, a machine that's as simple as can=
be.=C2=A0 Powered by a B&S Intek 12.5 HP engine, another simple machin=
e.<br><br>My friend was cutting his grass and managed to get the grass chut=
e tangled up in some old fencing.=C2=A0 He got it loose, and continued to m=
ow.=C2=A0 After a short distance, the mower quit running and would not rest=
art.<br><br>I brought it into my shop and we started troubleshooting. I fir=
st tried ether=C2=A0- it seemed like it tried for a second, and then nothin=
g.=C2=A0 Pulled the plug and it looked wet.=C2=A0 Turned the engine over wi=
th the=C2=A0plug connected and grounded, and observed a spark.=C2=A0 Not a =
magnificent spark, but a spark.=C2=A0=C2=A0<div><br></div><div>Verified com=
pression, but due to the position of the muffler, I could not get *any* of =
my compression testers to seal in the hole well.=C2=A0 But it pushed agains=
t my finger with some force.</div><div><br></div><div>Moved to the carb.=C2=
=A0 Pulled and inspected.=C2=A0 Float working, jet clear.</div><div><br></d=
iv><div>Put it all back together, and nothing.=C2=A0=C2=A0<br><br>Pulled th=
e ground wire off the magneto coil and no change.<br><br>So, I'm thinki=
ng weak coil.=C2=A0 Not completely dead, but not working under cylinder pre=
ssure.=C2=A0 Something else I read suggested a bad plug - this one was inst=
alled a month ago and has been working.=C2=A0 Date code on the engine indic=
ates it was built on April Fools Day, 2008.<br><br>In the era of $15 lawn m=
ower coils, I would throw one on with no qualms.=C2=A0 But at $40 or $50, I=
hesitate.<br><br>So,
=C2=A0tl;dr - should I try the plug first, skip ahead and replace the coil,=
or is there something else I should try?<br><br></div></div></div>
</blockquote></div>
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