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Old 09-27-2006, 08:12 PM   post #1 of 14
scale21
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Default testing the coil / shut off switch on 10301

I cant seem to get spark. I know i seen spark jump once or twice.

I have a clamp holding the handle down so it should be in the start position.......and i run a small cordless drill with a driver on the fly wheel to spin the engine with the plug out. (works well)....

Anyway i suspect either the shut off switch unit or the coil.

Is there any way to test either? I have a volt / ohm meter that i can put on the coil but not sure if i want volts or ohms or what the **** setting to put the tester on to get a proper reading. ....or where to put the leads for that matter.

Also...how does the switch assembly work. THe cable pulls the brake arm but thats all i see. There has to be more to it than that....
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Old 09-27-2006, 09:03 PM   post #2 of 14
Jason
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Default Re: testing the coil / shut off switch on 10301

The switch is probably a NO switch, or Normally Open. Meaning, when the bail is released, the switch opens, probably breaking connectivity in the ignition system. I may be speaking out of turn as I don't know the particulars of the Lawn-Boy ignition system, but in general, that's how most of the compliance brake systems work.

You should be able to use your ohm meter to test the switch. With the bail tied down (as you would operate it), I would expect the switch to be CLOSED, or showing ZERO resistance. If it shows a high or infinite resistance, the switch may be faulty.

But frankly, given the seemingly common problem of failing coils on L-B 2-cycle engines, I would think the coil would be a great place to start. It may be bad inside, not allowing spark to properly build inside. This could result in a weak spark or no spark. If it only shows a weak spark, and intermittently, I would suspect the coil.
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Old 09-27-2006, 09:23 PM   post #3 of 14
scale21
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Default Re: testing the coil / shut off switch on 10301

where do i put the leads for my tester? And what ohm setting? There is alot of them
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Old 09-27-2006, 11:05 PM   post #4 of 14
Walt 2002
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Default Re: testing the coil / shut off switch on 10301

LBs since the early D600s have a Kill switch. Releasing the handle bail closes the switch shorting out the ignition. To check, simply unplug the kill wire.

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Old 09-27-2006, 11:28 PM   post #5 of 14
scale21
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Default Re: testing the coil / shut off switch on 10301

the kill wire is the one that comes off the bottom of the coil........?? if thats the case and i i still get no spark...can i assume it is bad??
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Old 09-28-2006, 09:22 AM   post #6 of 14
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Default Re: testing the coil / shut off switch on 10301

Walt is correct -- I had it backwards. The switch is NC or Normally Closed. When you release the bail, the switch closes and basically grounds the coil to the block (no spark).

The "kill wire" is the small gauge wire that runs from the coil to the switch. If you unplug that wire from the switch, you're effectively taking the switch out of the equation. If you still get no spark, you can pretty safely assume it's the coil (that's bad).
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Old 09-28-2006, 10:49 AM   post #7 of 14
Walt 2002
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Default Re: testing the coil / shut off switch on 10301

These coil, like most LB CDI Units, have a high failure rate. I don't THINK these coils are available aftermarket, may cost close to $40.

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Old 09-28-2006, 11:11 AM   post #8 of 14
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Default Re: testing the coil / shut off switch on 10301

Quote:
Originally Posted by scale21
I cant seem to get spark. I know i seen spark jump once or twice. I have a clamp holding the handle down so it should be in the start position.......and i run a small cordless drill with a driver on the fly wheel to spin the engine with the plug out. (works well)....
Anyway i suspect either the shut off switch unit or the coil.
Is there any way to test either? I have a volt / ohm meter that i can put on the coil but not sure if i want volts or ohms or what the **** setting to put the tester on to get a proper reading. ....or where to put the leads for that matter.

Also...how does the switch assembly work. THe cable pulls the brake arm but thats all i see. There has to be more to it than that...
As I recall, that coil is grounded to run so...
when you pull the bail back you make the connection.
(that small black wire from the coil).
They sell spark testers for $12.50. I may even get one for myself.
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Old 09-28-2006, 01:56 PM   post #9 of 14
Walt 2002
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Default Re: testing the coil / shut off switch on 10301

Don't think so, you pull the bail back to BREAK connection, see above posts.

Walt Conner
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Old 09-28-2006, 02:06 PM   post #10 of 14
Jason
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Default Re: testing the coil / shut off switch on 10301

When the bail is pulled back, the switch is OPEN, which sends electricity to the spark plug. When the bail is released, the switch CLOSES, which provides a direct ground to the coil, and electricity no longer "flows" to the spark plug, killing the engine.
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Old 09-28-2006, 02:23 PM   post #11 of 14
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Default Re: testing the coil / shut off switch on 10301

Quote:
Originally Posted by Walt 2002
Don't think so, you pull the bail back to BREAK connection, see above posts.
Walt Conner
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Old 09-29-2006, 12:37 AM   post #12 of 14
scale21
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Default Re: testing the coil / shut off switch on 10301

just scored another 10301 so i can test the new mower coil on the other unit and see what happens....

Lucky me
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Old 09-29-2006, 12:51 AM   post #13 of 14
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Default Re: testing the coil / shut off switch on 10301

Quote:
Originally Posted by scale21
just scored another 10301 so i can test the new mower coil on the other unit and see what happens... Lucky me
hehehe...You are hooked so bad... hehehe
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Old 09-29-2006, 12:53 AM   post #14 of 14
scale21
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Default Re: testing the coil / shut off switch on 10301

ya no kidding.....cripes........there is somthing about that green though....
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