Engine started running rough. Would die at low idle speed...a few days later if appear to have a week battery and had to charge it to start the motor...it was time to do a spring time up anyway so changed oil & filter, air filter, spark plug....Sent to restart and it would not Frank completely over again..changed out battery and still would not crank fully...plug plug and was able to crank the motor freely, checked spark, it was decent. Took cool off, cleaned minor rust off of the face and check resistance on both legs to the plug wire 6k ohms also key switch wire was 6k...put the plug back in and now the motor still will not crank over completely