Posted by Steve@Advance on August 30, 2018 at 16:14:02 from (24.182.105.179):
In Reply to: wont run right posted by 1948jr on August 30, 2018 at 15:08:54:
Check the ignition system, be sure the plugs are fresh, change them if any doubt. Be sure the wires, cap and rotor are good.
Check the distributor shaft for side play, check the point gap, check the centrifugal advance, and the timing.
Assuming we're talking about a tractor, with an updraft...
Once everything is right, then go for the carb. Be sure there is sufficient fuel flow to the bowl. Get the engine up to operating temperature. Adjust the idle mix for best idle, then ever so slightly rich. Open the main jet adjustment about 1/8 turn at a time, give it sudden throttle from idle after each adjustment. When it's right, it will take throttle without hesitation. A single puff of black exhaust is desirable.
If there is no main adjustment, the carb will need to come apart and be cleaned. Pay particular attention to the main jet, scrape it out with a small wire, but don't enlarge it. Be sure the float level is to spec.
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