,goin thru similar hale,see above post ,,,are you certain you hace adequate gas flow to the carb?? I had weak spark at the points , so i grounded the distributor on the 511 ,,it started rite up and ran ,,,mowed about 50 acres ,that way , only trouble I had then was boilin in the gas line ,after 3 hrs runnin hard mowin ,, so I kept a water jug on the floor bd and would pour a little water down front of tank onto gasline and it would clear up ,, installed a tin baffle heat shield betwwen tank and engine and put some foil on the gasline ,, that helped a bunch ..probably not your current problem ,,. but it may become a problem ,if you run hard in hot weather ,,.the modern B/S gas in my area is oxygenated ,, and has ethanol too . it is my belief that such fuels boil at a cooler temp than REAL gass did when our tractors were built,, don't know for sure ,, wisht some wiser folx could chime in with ideas ,..with as much misfiring and orneryazzn going on with the 500 I am suspecting there is a bad valve ??? ..easiest thing for me to try 1st is check plugs ,,a backfire could have lodged some ancient carbon in the plugs and fouled one out , no lite show at nite with plug wires but , I will put a new set of plugg wires on the 511 , ,, itseems that 2 and 3 cyl,are misfiring ..
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