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|Charlie Coldham||I have heard it is possible to turn up the fuel pump on my 4640 just using a screwdriver to gain more hp. Is this true or will it just result in black smoke and overfuelling?
|Chris||If it is done correctly you could gain a small amount of power but most often it's done incorrectly and you get the results you described. Without altering the timming all that's accomplished is putting more fuel into the same burn window, resulting in problems.
Your best bet would be to upgrade to a tractor size that suits your needs.
|ross||If your going to turn up the injection pump, its a good idea to run it on a dyno to get a baseline on the horsepower. Usually a 1/4 turn is about 10 horsepower.
|nolin rhodehouse||I WOULD BE INTRESTED IN ANY HELP FOR JD 4640 POWER INCREASE. THANKS