White smoke, hard starting may not be injectors, but low engine compression. White smoke means fuel is getting into the chamber, but not enough heat from compression to burn. If the smoke clears on warmup that would point to compression and/or timing. If just one is causing the smoke you can find it by loostening the fuel line on each injector, if smoke stops when fuel is taken away that is the suspect cylinder. I have a TO-35 23C engine, after it was overhauled the blueish white smoke cleared. When I got it years ago it ran really bad cold due to low compression, old pistons and rings were shot.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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