Engine off, dash lever set to fast, the carb throttle plate should be in the wide open position.
Engine running at idle, while watching the carb, suddenly push the dash lever to full speed, you should see the throttle instantly go wide open, then modulate back to full governed speed, 1400 RPM.
Also check the distributor. Check the centrifugal advance, check for side play in the shaft. If either has a problem the timing will not stay set or function properly.
And check the air cleaner. There is a wire mesh element inside the canister. It is commonly clogged with dirt enough to restrict the air flow.
With everything in good operating condition, then the carb and jetting can be addressed. A properly jetted and adjusted carb should be able to take sudden throttle from slow idle without hesitating or balking. If it hesitates, it's too lean. Continued black smoke, sooty exhaust, black plugs, it's too rich.
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Today's Featured Article - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
... [Read Article]
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