Posted by Steve@Advance on October 03, 2018 at 05:52:00 from (24.182.105.179):
In Reply to: 9N lack of power posted by Steve Rose on October 02, 2018 at 20:48:27:
Might try a test run with the air cleaner tube disconnected. There is a wire mesh up inside the canister that periodically needs cleaning, also could be a bird, mouse or mud dauber nest inside.
While the tube is off, if you suspect the carb is flooding, look for dripping fuel when the engine is off. A few drops after it is shut down is normal, but it shouldn't continue to drip sitting with the fuel valve open. Also check that the choke is fully opening.
Do you know if it has the correct heat range plugs? If they are black, they may be too cold. If they are correct they should burn off clean once it is running right, but a new set will help in the meantime. Are the points set properly and the centrifugal advance working? Look the distributor over for side play in the shaft. Any play will change the point setting and cause erratic performance.
Is the thermostat installed and working?
Once you are satisfied everything is good, do the carb adjustment.
With the engine up to operating temperature, the idle speed around 450-500 RPM, adjust the idle mixture. This is the small screw up on the top by the bolt flange. Turning it out leans the mix, in richens it. Back it out until the engine stumbles, then slowly in to best idle, then ever so slightly in about 1/16 turn.
Next adjust the main mix, the larger screw on top of the bowl cover. Turn it in to gently seat, then back out 1 turn. To adjust, you want to lean it until it stumbles on sudden acceleration. Turn the screw 1/4 turn in, open the throttle a fast as possible. If the engine hesitates, start backing the screw out 1/4 turn at a time, repeating the test until it will take full, sudden throttle without hesitation. A single puff of black smoke is the target.
If the carb doesn't respond to adjustment, there could be a problem inside, like float level wrong, clogged passages, etc. The carb is simple, field serviceable. Don't be afraid of it. Lots of info online for servicing it.
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