Pyash555
07.05.2021 16:01:10
Turn the slow-speed idle adjustment screw clockwise with a screwdriver until the screw is seated without over-tightening the screw.
See full version: How to Adjust Slow Speed on a 6 HP Johnson Outboard
Turn the slow-speed idle adjustment screw clockwise with a screwdriver until the screw is seated without over-tightening the screw.
Adjusting the slow speed on a 6 HP Johnson outboard motor regularly will keep the engine running efficiently and provide better fuel economy. The slow-speed idle adjustment screw, also referred to as the low-speed needle, is located near the front of the outboard motor carburetor. The slow-speed idle adjustment screw can be adjusted in just a few minutes with a screwdriver, saving you time and money.
Adjust the slow-speed screw by turning it counterclockwise 1 1/2 turns with a screwdriver to find the starting point for further adjustment.
Adjust the slow-speed idle by turning the screw clockwise 1/4 turn at a time until the motor begins to stall; then turn it back counterclockwise 1/4 turn to find the proper setting on the 6 HP motor. here
To adjust the idle, there is a Pozi-Drive screw on the advance arm - looks like a Phillips screw. Loosen it a couple turns and ONLY move the inner ratchet lever one click at a time to advance the timing which increases idle rpm. Do not touch or move the outer ratchet as that is for WOT timing. The correct idle is 650-750 rpm using an accurate tach. Your boat tach is not accurate at that low rpm, unless it is a digital. here
This link shows the advance arm and screw at the top of the image. [links]
If the motor idle speed was OK before cleaning the carbs, then chances are the linkage adjustment is not correct. All the throttle plates have to be completely closed and all 6 open at the same time. Make sure the spark advance plate returns smoothly to its stop at idle, the original spring was known to break. The replacement design works well. more
Here is a link for an inexpensive digital shop tach
How do you adjust the idle RPM. more
Likewise, what RPM should an outboard idle at? For a passenger car engine, idle speed is customarily between 600 and 1000 rpm. For medium and heavy duty trucks, it is approximately 600 rpm. For many single-cylinder motorcycle engines, idle speed is set between 1200 and 1500 rpm. Two-cylinder motorcycle engines are often set around 1000 rpm. more
Turn the idle speed screw on the carburetor linkage to adjust the motor's speed to between 700 and 800 rpm. Put the motor in "Forward." Turn the mixture screw clockwise until the motor begins to misfire. Turn the screw counterclockwise one-quarter turn or until the motor no longer misfires.
Also to know is, how do you adjust a Johnson outboard carburetor?
Adjust the knob until it is close to the trolling speed, and turn the carburetor idle knob — located on the side of the carburetor — clockwise 1/4 turn at a time until you hear the engine begin to stall.
Sorry for writing a novel, and thanks for all the helpful posts. [links]
On an engine with EFI, the fuel pump is typically an electric pump, that pressurizes the system to a certain PSI and delivers it on demand.
MOTORS:
69' 6 hp Evinrude
71' 6 hp Johnson
85' 90 hp Evinrude
87' 9.9 hp Johnson (modified to 15hp)
88' 25 hp Johnson (modified to 30hp)
93' 120 hp Johnson
If it starts good, idles good and runs at WOT good then there seems to be an issue with fuel delivery when the timing is advanced on the motor. Whether to much or to little? Running good at WOT means the carb is delivering the correct amount of fuel when the motor is fully advanced. here
Post by srr5008 » 21 Mar 2012, 16:06 more
A conventional fuel pump, like on a 2-stroke engine, uses a 'pulser hose' that's hooked to the crank case to operate the diaphragms to pump fuel. On the downstroke of the piston, air is pushed one way through the diaphragms, creating positive pressure, pushing fuel to the engine. On the upstroke, it generates a vacuum, which draws fuel from the tank. Internal check valves within the fuel pump also assure that the air pressure used to operate the diaphragms only runs one way. If one of these check valves goes bad, this can cause an issue with the proper operation of the pump.