Posted by Steve@Advance on January 20, 2017 at 18:45:50 from (107.203.134.67):
In Reply to: Ford 901 Powermaster posted by Retired Farmer on January 20, 2017 at 17:48:17:
Some of those used a power valve, some didn't. If it ran without it, it probably never had it.
When adjusting the carb, be sure the engine is up to temperature and is properly tuned. If it has other problems, it will be near impossible to get a good carb adjustment.
Start with the idle stop screw, get it idling around 400-500 RPM.
Next adjust the idle mixture screw, the smaller screw just under the mount flange. This screw adjusts the idle air mix, so turning it IN enriches the mix, turning OUT leans it. Turn the screw OUT until the idle stumbles, then turn it slowly in to best idle, then about 1/8 to 1/4 turn further in. That will slightly enrichen it for easy no-choke hot starts.
Then adjust the main power jet. Start with the screw about 1 1/2 to 2 turns off the seat. Set the engine to full governed speed. Manually pull the throttle linkage to idle, and then let go of the link. The governor should quickly full throttle the engine until it gets back up to speed. (If this doesn't happen, revisit the governor linkage adjustments.) As the engine comes up to speed, listen to and watch the exhaust. The engine should take throttle without hesitating. Start turning the main jet screw in about 1/8 turn at a time, repeating the test. It will get so lean that the engine will stumble or die when accelerating. Start backing the screw out until it will take throttle without stumbling. A single puff of black smoke is what you want to see.
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