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well so if you have a weak spark, you are only igniting a part of the fuel, and then that fuel ignites the rest. if you put more joules through the plug (joules is basically heat... factor of power over time) then the spark contributes to igniting more of the fuel. if you are running very high RPM with high compression (lots of other circumstances but these effect it the most) then its possible to complete the burn cycle while still having unburnt fuel. having a hotter spark can start the combustion faster, which means you are able to get a more complete burn. more fuel burnt, more power output.
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