What breaks when an LB/ Toro coil fails? - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
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post #1 of 32 Old 06-30-2019, 07:31 PM Thread Starter
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What breaks when an LB/ Toro coil fails?

The symptom. run it for an hr or so , shut it off and it will flood if it isn't allowed to cool for an hour. Then it will start on 2nd pull same as always. Something is heat soaking and opening, I think
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post #2 of 32 Old 06-30-2019, 07:34 PM
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Re: What breaks when an LB/ Toro coil fails?

Good description of the coil problem. Roger
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post #3 of 32 Old 06-30-2019, 07:56 PM
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Re: What breaks when an LB/ Toro coil fails?

Shut fuel off 5 seconds before stopping engine. IF it has no shut off, pinch fuel line with vise grip. IF that helps, add fuel shut off.

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post #4 of 32 Old 07-01-2019, 12:13 AM Thread Starter
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Re: What breaks when an LB/ Toro coil fails?

Thank you Walt. This is like issue #3. I normally use the mower as a close in trimmer Maybe a 1/2 hr at a time. My son won't use the sitdown. He prefers the Toro. So it ran maybe an hr and a half. Then wouldn't start for anything. 2 hrs later, it starts easy. I normally run the carb dry when I'm done mowing. Should I extend that to rest stops too?
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post #5 of 32 Old 07-01-2019, 08:32 AM
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Re: What breaks when an LB/ Toro coil fails?

Quote:
Originally Posted by andyma View Post
Thank you Walt. This is like issue #3. I normally use the mower as a close in trimmer Maybe a 1/2 hr at a time. My son won't use the sitdown. He prefers the Toro. So it ran maybe an hr and a half. Then wouldn't start for anything. 2 hrs later, it starts easy. I normally run the carb dry when I'm done mowing. Should I extend that to rest stops too?
No, I said 5 seconds or so.

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post #6 of 32 Old 07-01-2019, 06:05 PM
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Re: What breaks when an LB/ Toro coil fails?

Quote:
Originally Posted by andyma View Post
Thank you Walt. This is like issue #3. I normally use the mower as a close in trimmer Maybe a 1/2 hr at a time. My son won't use the sitdown. He prefers the Toro. So it ran maybe an hr and a half. Then wouldn't start for anything. 2 hrs later, it starts easy. I normally run the carb dry when I'm done mowing. Should I extend that to rest stops too?

Sounds to me like your coil is going out. What model of mower is this? Some LB/Toro coils were prone to failure. A way to check for spark is to run it as you normally would. Then, when it won't start, pull out the plug, attach it to the lead, ground the plug, then pull the rope over and see if there is spark. If there is no spark, you have a coil problem. If you still have spark, then you likely have a carb issue.

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post #7 of 32 Old 07-03-2019, 01:02 PM
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Re: What breaks when an LB/ Toro coil fails?

Quote:
Originally Posted by andyma View Post
The symptom. run it for an hr or so , shut it off and it will flood if it isn't allowed to cool for an hour. Then it will start on 2nd pull same as always. Something is heat soaking and opening, I think
My Toro did the same thing. It was the auto choke.
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post #8 of 32 Old 07-03-2019, 09:48 PM Thread Starter
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Re: What breaks when an LB/ Toro coil fails?

The carb has accumulated 3 issues. A leaking bowl seal The throttle cable isn't grounding out the coil in OFF and the bowl is rusty inside. It is a Mikuni and parts for it are ridiculous. I'm going to soak the bowl in CLR. de-gunk the exterior and adjust the throttle cable. I'll post results
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post #9 of 32 Old 07-05-2019, 09:29 PM Thread Starter
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Re: What breaks when an LB/ Toro coil fails?

This is a Suzuki 4 stroke engine. It has a Mikuni carb. the shroud had never been off in my ten yrs of use. Engine was covered in oily dirt. I used various tools, a spray bottle of household degreaser and a hose. I'm heartened to see the the tips of the coil legs were greasy but for a single clear line. A few seconds on my wire wheel and they look like new. Gonna let it dry off over night then reassemble. This engine is gonna dissipate heat lots better. Mower is a pound lighter at least too. There is an extra pigtail coming out of the coil that is screwed to a leg grounded? Is that a secondary that allows advance at RPMs?. It is put together with 10mm bolts. I was using my 1/4 Craftsman breaker bar to break and then spin out. the bolts holding on the shroud and the exhaust shield They felt very evenly torqued. I don't think its ever been this far apart before. 25 yrs of mowing a single yard? I'll report back after I bench test it.
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post #10 of 32 Old 07-06-2019, 03:59 PM Thread Starter
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Re: What breaks when an LB/ Toro coil fails?

The coil is done. I can buy 2 HF Predator engines for what a new coil would cost. I will only do it if I can keep the BBC and the drive. Time to take the 4 stroke LB off the shelf. The Suzuki is a well made engine, it was fun to work on Oh,well.
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post #11 of 32 Old 07-07-2019, 07:44 PM Thread Starter
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Re: What breaks when an LB/ Toro coil fails?

Pulled the LB 10302 out of storage. I put it up on the bench. I cleaned and lubed the various cables. I was expecting coil adventures, so I took the starter off and used a drill with a 13/16 on the crank nut. Strong blue spark. I filled the tank with gas and put the plug back in. At first the carb dripped gas. A tap on the bowl to free the float fixed that. It lit with a just a touch of the drill. I cleaned the shroud and the screws and put it together. It started with an easy pull. Last night, just for grins I priced TVS151 coils . 12 bucks

In the fall of'09 I was nervous about chemo. I wanted something low impact for entertainment. I picked the 20622 and the 10302 off Craigslist free stuff. Good idea, except I managed to keep working for most o the chemo. and I fixed both mowers in an afternoon. I went with the Toro because I was familiar with the 3spd and AL deck. almost 10yrs later, it is the LB's turn.
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post #12 of 32 Old 07-10-2019, 10:05 AM
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Re: What breaks when an LB/ Toro coil fails?

Can a coil have an intermittent open? 45 minutes of mowing engine sputters loosest power. Disengage the clutch and the engine dies, no spark. Choke plate half way wide open. 20 minutes later fires right up and mows for half hour and the problem returns. Six year old Toro 20383 BBC 159cc "Toro" engine. Thanks.
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post #13 of 32 Old 07-10-2019, 04:56 PM
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Re: What breaks when an LB/ Toro coil fails?

The farmers when I was growing up who dealt with tractor coils told me that the copper windings with the thin insulation coating chaff due to thermal expansion and contraction. Once chaffed through after operating temps are reached the copper windings become shorted and at that point of expansion it is a “No-go”, bu let it cool and the coil windings contract and the “Short” goes away and thus the spark returns. With solid state modules there are even more components to fail.

Last edited by Lawnboy77; 07-10-2019 at 05:07 PM.
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post #14 of 32 Old 07-10-2019, 05:14 PM
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Re: What breaks when an LB/ Toro coil fails?

Yes they can and do have intermittent opens. Mostly heat related. Roger
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post #15 of 32 Old 07-10-2019, 09:05 PM Thread Starter
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Re: What breaks when an LB/ Toro coil fails?

I have various coils I could try, Say I get close to a fit with the help of a Dremel and a drill press?
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