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I understand this is one of THE places to be for 2 stroke help so here goes.
I have a ‘78 Peugeot 103. It’s got a 49cc 2 stroke. It’s got 148psi compression. It’s got enough spark to power a small country and it’s getting fuel. I can’t make it fire. It won’t even pop. I’ve put fuel right in the hole. I’ve even tried a snort of starting fluid. Nothing. I verified the timing. I connected a timing light (wired to a 12v battery) to the plug and it doesn’t skip a beat. The timing is possibly off by 1 or 2 degrees. Not enough that it wouldn’t pop...I wouldn’t think. The only other thing I can think is crank seal. But not even a pop? Help. Thanks
 

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If the spark voltage is weak then it will spark with the plug outside the engine but not inside it. The older the engine is, the weaker the magnets in the rotor that induce voltage in the coils. So you can either replace the magnets or rewind the coils with more turns to increase the voltage they put out to the CDI.
 
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