Well first off When was the last tune up and timing check done on her ?? When was the last time the valves were adjusted . Then i would try and adjust the idle screw and the bleed screw and make sure that the idle RPM is correct. As for the main fuel load screw they did away with them many years a go because people would try and lean them back and melt them down When you lean a gas engine out tomuch she gets really hot in there and when worked hard ya get the same think today with the 87 octane in a C263-301 . And now we are starting to see the same thing on the old M's and 450 gassers in our area trying to run the 87 , you start to put her to work and like pulling a loaded silage wagon out of the far end of the field in soft ground once my buddy's 400 with a 450 kit in it starts to work in about a 100 feet she starts to loose power Ping and knock and just up and die . HE argued with me about this for two days and he went and got 40 gallon of 93 and put in it and she was back up and pulling like she was suppose to . Also so i have noticed that there has been a bit more hazzing at idle and also when you first nail the throttle The gassers are Puffing a little like a diesel It just could be the fine gas that we get today .
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