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I recently acquired a 1963 10hp that had been sitting for about 20 years. I installed a new impeller, cleaned the carb and installed a kit and float. I was ready to clean and set the points when I found both coils were cracked. I replace both coils, cleaned and set the points and put it all back together. When finally got it running I discovered it won't idle. It runs at high speed pretty smooth but a I back the throttle down it starts to buck then dies. Adding fuel does not change the problem. The way it bucks I an convinced it is ignition. I have points ordered but they won't be here for a couple days. Does anybody have any thoughts?
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Points, timing, and low speed mixture screw are the basics for those older motors to idle properly.
If you didn't soak the carb(s) well, and blow through the air & fuel pas-sages thoroughly with compressed air, you may still have problems with carb(s).
Also, it is not uncommon, to get a bad plug when purchasing new ones. Check that they are firing through the tip of electrode, and not shorting through the insulator inside threads.
Good luck.
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