The fuel for idle goes past main jet, the larger jet. The idle circuit adjustment is backwards of the main jet. Turn main jet in to lean out. Turn idle jet in and it should get richer. That's how it works on my Jubilee. Check to make sure if you Crank main jet in all the way in, it will starve engine for fuel and die. A friend rebuilt his carb and put washer on the main jet out of the kit and it prevented the main jet from going in far enough, too rich of mix.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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