I'm new here but from reading what you said i would pull the spark plug out and then put it back into the plug cap( with help from an adult ) and ground the plug end( that goes into the motor) then pull the motor over and see what color spark you have( bright blue is what it should be...orange means you have weak spark ). This could cuase it to be hard to pull over due to it not igniteing the fuel ( no combustion means your feeling the compression of the motor ).If its not that, unscrew the plug cap off of the spark plug wire and cut back the wire and then screw the plug cap back onto the plug wire( just too make sure you have good contact ) because you said that it would start after you took the cap off the plug and then put it back on( it could have made a better connection from being moved around )..If it not any of that replace coil and spark plug.
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