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repair Toro 2 stroke ignition coil?

825 Views 5 Replies 5 Participants Last post by  Joedaddy
I have an old Toro 2 stroke lawn mower that has an electronic ignition embedded magneto style coil. I suspect the coil is failing; It Quits before I'm done cutting the lawn. It has no spark unless I let it sit for about 30 minutes , then it starts again. New coils are over $300 and I'm too cheap to spend that much. I've looked on E-Bay and Amazon, even bought a used one for about $50, but now after about 5 years that one is doing the same thing.

I believe I read somewhere that someone was able to add one of those universal replacement ignition modules that are sold under various names; Nova II, Oregon 33-053, etc. and make the coil work again.
Can I just add one of these modules to the terminal on the primary wire of the coil, the wire that goes to the kill switch, or do I have to find the embedded module and disconnect it first?
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I have heard that others have gotten a coil from an old 2 cycle snowblower with a suzuki engine and used it. Those engines can be had for a song, if the swap indeed works. Let me look for my post on another forum.
Found it:

I know that the Toro 2 cycle mowers have very hard to find coils. And, when found, they are over $200 new. I stumbled across this. Wonder if it would work or not.

Many of the 47P parts off the CCR3000 (and CCR2000 I believe) will interchange.
The CCR3000 is a snowblower engine. Post said you use the snowblower flywheel as well as coil to make things work.
It is possible to replace the ignition module on your Toro lawn mower with a universal replacement module, such as the Nova II or Oregon 33-053. However, before attempting to do so, it is important to make sure that the ignition module is indeed the problem. There are a few other things that could cause the mower to stop running or lose spark, such as a faulty spark plug, a damaged flywheel magnet, or a problem with the fuel system.
To determine if the ignition module is the problem, you can try the following steps:
  1. Check the spark plug to make sure it is in good condition and properly gapped.
  2. Check the flywheel magnet to ensure it is not damaged or loose.
  3. Check the fuel system for any blockages or leaks.
If these checks do not reveal any problems, you can try replacing the ignition module. To do this, you will need to locate the module and disconnect it from the primary wire of the coil. You can then connect the universal replacement module to the primary wire in its place. Make sure to follow the manufacturer's instructions for installation and wiring of the replacement module.
If you are not comfortable working on the mower yourself, or if you are unable to diagnose the problem, it may be best to have a professional service the mower for you.
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Check for corrosion on the head bolt's, that's what grounds the head and the spark plug grounds through that. I've have a few engines with no or week spark and I've loosened and tighten the head bolts and fixed the problem. Do one head bolt at a time so yo don't comprise the head gasket.
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If you are sure it is the coil try this. FWIW I have done it twice and both times it worked for about 2 seasons each time. NOTE: coils when old, casing starts to crack and moisture seeps in, which is the culprit so this is why this will work. You are drying out the moisture.
Take coil off of engine. Clean coil with dry cloth. Place the coil on an old cookie sheet or put tin foil on a good cookie sheet, make sure your wife doesn't mind, lol. Put in oven at 250 degree F and leave in oven for 2-3 hours. Turn off the oven and let coil and oven cool. Remove from oven place on mower. Again this has worked for me twice and mower started up on first pull every time and even started when hot. NOTE: I do this in the evening 2-3 hours before bed time and let the oven cool overnight. Another thing, no smell from oven. I figured it would stink up the house but it didn't.
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