Well here is my take on this if you have a flutter at a no load cond. i would be looking at the dist. as it may have bad bushings or weak or broken springs . Now here is where ya need to make sure that you also have the correct dist. in that tractor for the engine . As there were several different dist. used and depending on what fuel that engine was made to run on . If it came as a distl. from the factory then the timing curve is set different then a gas and at high idle it will throw 30 degrees total advance to much advance with a gas set up as a gasser only gets 22 degrees total .And here again with todays gas even 22 degrees can be to much . With out knowing everything about that engine as to what pistons and what head and so on all ya can do is get them close . A no load miss can cause a good mechanic to indulge in the spirit's trying to make it go away. Heck it may even be back lash in the timing gears . Our like BOB said fuel related . Myself the first place i would start would be the dist. , BUT i have the leg up on most for this as i can pull the dist and put it on the strobe and run it off the tractor and see what it is doing as far as advance curve and points bounce and shaft run out. On my machine i can run the dist up to 9 grand engine RPM . When one buys and old tractor ya never know what all has been done to it over the years . So it turns into a craps shoot trying to make it perfect . SO if ya could find some old geeser like me that has a old SUN or ALLIED dist strobe and knows how to use it then get and I T manual for the 300-450 as the old copy of it has all the spec.'s for the different dist. and you can see if yours is doing what it is suppose to do when it is suppose to do it. once that is correct then ya move on to the next problem area . So for the correct engine timing if it was a Gasser from the factory with a gasser dist and carb then the correct engine timing is 22 degrees at high idle .
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