Quote:
Originally Posted by JSchmitz
This is incorrect. It is NOT reverse (left-handed) threads. It is right-hand threaded. It is true that the nut turns the needle and seat assemble and the slotted screw is the "jam-nut" or locking device. Turning the nut clockwise lowers the needle and seat. That pushes the float, and subsequent fuel level, down. Don't keep running the car with the bowl overfilled. Loosen the screw and turn the nut a few revolutions clockwise. Now start the car, remove the sight plug and hopefully bring the fuel level UP to where it needs to be. Just put a rag under the sight plug hole in case it still spills some out.
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That is what I said. Clockwise lowers the fuel level.
If you've ever held a nut and bolt in your hand, bolt head facing down and turned the nut clockwise, which direction does the bolt (float) advance? Up, of course. It is reverse threaded since the "bolt" or float advances downward when when the nut is rotated clockwise.
Brawler carbs do not have removable sight plugs. That is why it is recommended to adjusting while running. The engine will use the excess fuel level up as it runs and you adjust the float downward.
From the Brawler manual:
3. Before starting the engine make an initial check of the float level.
This carburetor was pre-set at the factory to be in the middle of the sight glass at 6.5 P.S.I. Fuel pressure greater than 6.5 P.S.I. will cause the float level to be too high. Conversely, if the fuel pressure is significantly below 6.5 P.S.I., the float level will be too low. For the carburetor to operate correctly, the float levels must be in the middle of the sight glass. The most accurate way to establish the correct float level is to check it while the engine is running. If the initial float level is not visible in the sight glass, then it might be necessary to readjust the float level before starting the engine.
You can rough index the float lower with quarter turn intervals not running as the excess fuel will be released when the jam screw is loosened but adjusting while running will accomplish the same without guesswork and the possibility of setting too low so as to not start.