i have noticed while mowing grass that my briggs 6hp quantum (side draft carb)will develop an occassional miss especially after 5 to 10 minutes of running.up to this point it is perfect.i am very strict on fresh fuel ,clean air filter,frquent oil changes.its just a occassional puff,puff then runs fine. i have a fresh rj19lm plug installed @.030 thou.in line fuel filtr(bgiggs 150 micron) also installed.tank vent is good.could i have a spark plug wire jumping to ground?i did apply diulectric graease inside the boot.could my coil be getting weak?by the way ,after mowing (engine hot)the engine has great compression and restarts on first pull.i fear i have an exhaust valve going bad.engine has low hours.i hope one of you pros can help me.thank you for any input.
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