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Leo, the first place to look is at the carb load needle adjustment. Try leaning that up as much as you can & still have it pull a load [maybe start at 3/4 turn open from seated & see if it will pull there, if so try slightly farther in. ~You could have an economizer plug it that carb that is for a thicker fuel. Running gasoline would require a slightly smaller economizer plug [screw] for best economy.. I believe your carb came with a C in it.. I don't have chart handy but you might call Roberts Carb [Phone: (712) 262-5311] to see what economizer plugs are still available. ~Here's a biggie on fuel economy.. MAKE DARN SURE your air cleaner isn't plugged [especially the inner wire mesh].. That air cleaner inner mesh tends to plug with years of dirt & junk & that can really effect fuel economy.. About all you can do is pull it off the tractor & soak it in solvent then wash it out [or have it boiled out].. The other alternative is to drill the welds out & take it apart to clean it. ~You might have an ignition timing problem.. If your ignition timing is running late [retarded] that can kill your fuel economy.. Tell us what mag you are running on that A & we can help you there.. Of just advance your magneto until it starts to spark knock under load, then back it off until the knock goes away.. [top of mag turned to the rear advances the spark] ~On your burning diesel fuel question.. You can try it but diesel fuel isn't blended for a spark ignition engine & a lot of it will get by the piston rings & pollute your engine oil.. There are more BTU's per gallon in diesel so you would get better economy but some of it might have to be given back up as it probably won't work under a load with full ignition timing. A 50/50 mixture of diesel & gasoline would probably burn better but would still eventually foul your engine oil & coke up the backs of your exhaust valves. You will also have to keep the engine temperature up to burn a diesel type fuel or even a 50/50 mix.. You are much better off with gasoline or kerosene.. ~Basically.. Make sure the air cleaner isn't plugged, then play with the load needle & ignition timing & see if you can't improve your economy that way.. I have a 37 A & while I don't work it hard it seems to run forever on a tank of fuel.. ~On the manual? There isn't much for that 37 A, a good parts manual would be a good idea but the operators & service manual is a little lacking. There is a basic INSTRUCTION manual for the old A's & it covers basic repairs & fluid changes.. All I have is a re-print without any manual number but it's for the A prior to s/n 477000.. [email protected]
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