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Techumseh HH120 Solid State Ignition Replacement in a Bolens 1257


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Old 08-17-2019, 06:00:44 PM
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Default Techumseh HH120 Solid State Ignition Replacement in a Bolens 1257

The Solid state ignition was found to be bad on the HH120 Techumseh in this Bolens 1257 (a common issue). I built a replacement using scrap aluminum, a GM HEI ignition module (from a early 1980s GM distributor), a 2000 Ford F150 rear differential antilock brake sensor (used as a magnetic pickup, triggered by the stock trigger pins on the flywheel) and a ignition coil from a 1978 Ford F150. $12 in parts from the local you pick auto part salvage.






Works well. The owner (my 10 year old) couldn't be happier!
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Old 08-18-2019, 01:11:11 AM
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Default Re: Techumseh HH120 Solid State Ignition Replacement in a Bolens 1257

I did a write up per the request of a few users. I have uploaded it as a pdf document to make it easy to download and use.
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File Type: pdf Tecumseh Solid State Ignition Conversion.pdf (234.3 KB, 21 views)
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