What happens if carburetor float is too high?
In an extreme case, if the floats are set too high, fuel will overflow via drillings inside the carb body. In addition, fuel may flow into the engine unrestricted, which, if the engine is not running, can cause hydraulic lock – that is, as the piston rises on the compression stroke it cannot compress the fuel.
Does float level affect idle?
The float height adjustment will mostly affect only part throttle openings.It has a static setting that,when at idle,the float valve will open only very small amounts.At WOT (Wide-Open-Throttle) the float will be at its lowest for full fuel flow,so the height adjustment will not affect WOT.
How do I adjust the idle on my Evinrude outboard?
The ideal idle is somewhere near the midpoint of this range, about 750 rpm. Loosen the lock nut on the idle speed adjustment screw with a small adjustable wrench. Turn the screw clockwise with a screwdriver to increase the idle speed; turning the screw counterclockwise decreases the idle speed.
Does float height affect mixture?
In other words, it’s easier for the fuel to be drawn up through the jets, You get more fuel flow which richens the mixture. By the same token, lowering the fuel level (raising the float height)results in less fuel being drawn in making for a lean condition throughout the range.
How do I adjust the idle on my Evinrude 90?
Loosen the idle speed screw’s lock nut with a 3/8-inch open-end wrench. Turn the idle speed screw with a standard slotted screwdriver until the tachometer indicates the idle speed is between 800 and 900 RPM. Tighten the idle speed screw lock nut.
Where do you measure float height?
The distance to measure is typically measured from the float chamber face – or gasket surface – to the highest point of the floats. If the floats are not at the proper height, most floats have a smakll tang that contacts the float needle which can be bent gently to adjust.
Can a second boater adjust an Evinrude carburetor?
Evinrude carburetor adjustments should be made with the motor on the boat and underway. A second boater is required to navigate and control the vessel while you make the adjustments. These adjustments require you to work in close proximity to the engine’s moving parts, which poses potential safety risks.
Where is throttle control rod on Evinrude Outboard?
It should intersect the cam follower (the plastic barrel on top of the carb), at the two marks on the cam just as the carb starts to open. You can also check the throttle control rod. It is the small wire/rod connected to the throttle shaft on the port side of the engine.
Where are the high speed jets on a Johnson Evinrude?
BUT do make sure that you manually inspect and clean the two brass fixed high speed jets which would be located in back of the two 7/16″ slotted hex head bolts in the bottom front portion of the float chamber. Lift the center High Speed Control lever and turn it so that the point faces forward, resting on the high ridge.
Why does my Evinrude run lean at idle?
If it doesn’t the engine can run lean at idle. There is an oil recirculation hose under the carb going to the intake manifold. Check this hose for any cracks or splits. Your carb idle mixture should be around 1 3/4 turns out Check the needle for any grooves on the the or bending.