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Modification of commercial Chinese Hit & Miss engines.

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Bruno Mueller:
I smoked the ignition electronics on the Retrol Musa HM 01. No, it didn't smoke, but I had no ignition spark.
As a precaution, I bought replacement electronics a few weeks ago. After replacing the ignition box, the device is working again.
Everything in the ignition box is filled with potting compound, so nothing can be repaired.

Admiral_dk:
That is annoying  :zap:

The potting can usually be removed using heat ....
The compound usually breaks down around 150-160 degrees centigrade ....
I use a temperature controlled hot-air gun and small screwdriver / tweezers, to gently lift the compound (epoxy) away.

Per        :cheers:

Bruno Mueller:
The next hit & miss engine was a tiny one with an even smaller spark plug. The spark plug thread was 3/16 x 40 threads. Getting these spark plugs is not that easy. I searched and found some with the 10-40 thread and ordered them. It turns out that these spark plugs had a completely different thread. M5 x 0.5 mm. I wanted to have a replacement just in case. However, I didn't want to convert the existing cylinder head to the new thread. I made a new cylinder head with the M5 x 0.5 mm thread.

http://www.youtube.com/watch?v=PlqQY8Cpfc8

Admiral_dk:
Great runner - hit and misses nicely  :ThumbsUp:

Per      :cheers:

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