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The enrichment solenoid is called a primestarter. The way that thing works is inside of it there is a heater element that is surrounded by a ball of wax. On a cold engine, when you cold start it. That wax is cold, and what happens is there is a spring inside of the body of the primestarter attached to a needle. When cold, the spring pulls back on the needle, which opens up a fuel passageway, and gives the engine the extra fuel it needs for cold starter. As it runs, the heater element heats up, which melts the wax and expands it, which pushes the needle closed, and leans out the fuel mixture for proper operation. If the primestarter is not working, what ends up happening is just the opposite of a clogged idle circuit. What happens is to much fuel is flowing to the engine at lower rpm, and it ends up flooding out. The easiest way to tell if that primestarter is working is let the engine run at a high idle for about 10 minutes, and then simply touch the body of the primestarter with your hand. It should be very warm to the touch (because of that heater element). If it's cold, it's bad. If its hot, it's good, and the carb itself is clogged. Does that make sense?
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