In my opinion the simplest way to kill your engine without having everything reset would be to "kill" the coil - i would find the power wire going to the coil and put a normally closed relay in that line - run a small switch to activate the relay to put an open in the circuit - this only kills the spark - everything else works the same (if you want to restart the engine just release the relay and you would have spark again- if the engine were turning <vbg>)
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