Can't accurately check it that way, gap and ground are everything in regards to heat and length of spark. You gotta put a solid ground on the spark plug thread, hook the spark plug wire to the plug and watch spark across the plug gap. Do it with the #1 cylinder and while watching the plug see if it sparks just before tdc. Stick your thumb over (not into) the spark plug hole while some cranks the motor. You will feel the intake, compression and exhaust. Also I agree with jd seller put a distributor on it. My dads old sc case and his 75 horse Johnson outboard had mags when I learned from him. What I learned is they are touchy pains in the uh "neck"
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