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One problem with this type spark plug, which has the electrodes coming from the side, rather than underneath the center electrode, the area where spark ionization takes place will be exposed to the incoming charge. I eliminated this problem with the use of a very powerful secondary coil.
150 psi looks like a lot for a two stroke! May I ask what kind of compression ratio are you running?
No worries Jim.But I will admit to being curious about the "end" off one of the stingers - never seen anything like it before.Per
It's a simple design, low restriction type muffler.