How do i fix poor idle performance on 4hp outboard

Adjust tighten until peak idle revs are reached and then descend leaned out. I have a Tohatsu 4 stroke 4hp outboard that either wont start or runs and quits after about 2-5 minutes even in neutral.

Heres a Force outboard and a simple c.

How do i fix poor idle performance on 4hp outboard. In this video I show you a quick fix that can make your honda outboard motor idle good againVisit my channel for more repair videos. Dismantle the carburetor and thoroughly clean it or replace the jets to improve the motors performance while idling. Hopefully these inspections help you identify the problem preventing your outboard from idling properly.

And if the problem with your outboard is that it just wont start weve got that covered too. Adjust tighten until peak idle revs are reached and then descend leaned out. Go back to peak revs then back off a quarter turn.

That should put you as close as dammit without diagnostic kits. Pull the cowlings and inspect your outboards powerheads to make sure nothing looks out of the ordinary. Keep the propeller shaft greased and if you boat in salt water take the cowling off and wipe down the motor with CRC or another lubricant.

In short become a DIY boater. Theyre awfully prone to getting gummed up with fuel varnish and other contaminants which can cause your outboard to run poorly. The first and easiest thing to do is to spray carburetor cleaner in your carburetor.

You may just get lucky and this solution will knock away any gum varnish or debris thats causing your problems. How To Diagnose and Replace A Bad Outboard Coil Pack - YouTube. When your outboard is overflowing fuel or just getting too much the problem is your fuel needle and seat not sealing.

Heres a Force outboard and a simple c. By increasing the idle speed it can be made to idle very roughly with the choke half way in but seems to choke itself and die as soon as the revs are increased. And even with the highest idle setting it will not run at all with the choke fully in.

The idle adjustment is on the underside of an outboard carburetor. Use a small adjustable wrench or screwdriver and rotate the idle adjustment 14 turn clockwise until the engine idle slows. Rotate the valve counterclockwise in 18-turn increments until the engine idles smoothly.

Turn the needle in small increments allowing at least 15 seconds for the idle speed to stabilize before making further adjustments. After the final low speed adjustment is made turn the low speed needle out counterclockwise 18 of a turn to make sure it is not too lean at idle speeds. I have a Tohatsu 4 stroke 4hp outboard that either wont start or runs and quits after about 2-5 minutes even in neutral.

The gas tank is clean the fuel filter is new and the fuel pump works fine. I disassembled the carb cleaned with carb cleaner and blew it out with compressed air. Fuel is new 87 octane but does contain up to.

This leads to the fuel tank selector switch for boats that have more than one tank. Or if your boat doesnt have a selector switch it should lead to a fuel water separator. Once the fuel passes through the water separator it then comes out the other side into a primer bulb or straight to the engine.

Yamaha Outboard HPDI spark plug and coils test and troubleshoot bad idleperformance - YouTube. How to check why outboard is not idlingperforming correctly. Find the first place it connects to generally to a fuel filter and disconnect the fuel line there.

Insert the clear hose into the fuel line prime up the engine and start it up. Let it run for a little while and carefully watch the fuel passing through the clear hose. Check the engine oil levels next.

Ensure that the outboard motor is in an upright and level position. Then remove the oil filler cap and the connected dipstick from the oil tank. Wipe the dipstick with a cloth reinsert it fully then remove it and check the oil mark on the side of the dipstick.

Fuel should travel easily from the tank all the way to the pump. Your outboard fuel filter located just before the fuel pump should be full. With the engine off and the cowl cover removed remove the spark plug wire boot and remove the plug.

Attach the compression gauge to the spark plug hole. Adjusting the 2-cycle outboard motor carburetor will keep the engine running properly while providing better fuel mileage. The 2-cycle outboard carburetor has two adjustment knobs a large stop screw knob on the left side of the motor and a carburetor idle knob on the side of the carburetor that allow you to set the carburetor for the best performance in just a few minutes.

The flywheel nut holds the tubing down tubing holds the cam down. Double check your points gap 020 anything dramatically more or less may throw timing off enough not to fire. These need to be set at the highest part of the cam lobes and if off just a slight bit can effect the timing.

Set the points as follows. Your outboard motor is the heart of your marine vessel and if it is having trouble with the fuel supply it can put a damper on your day on the lake river or ocean. Two of the most common problems when it comes to fuel supply in your outboard motor are bad fuel and a bad.

These idle mixture adjustment tuning procedures apply the Mercury outboards manufactured between 1965 thru 1989specifically 45-HP to 115-HP models. Its highly recommended to follow the idle mixture adjustment procedures in the factory repair manual. A downloadable version of the factory manual is available from this site.

55EL78Spoor idle no power major fuel consumption. New fuel pump compression wnew gauge 140145. Runs like a bat out of hell on seafoam mix.

But badly on reg fuel. Did the spark plug wire pull test. Pull wire engine almost.

I have a 1985 Johnson 150. The engine idles great on a hose and in the water. But when I throttle down to get on pad the engine bogs down and will stall.

If i throttle down and choke it before it stalls it will take off and run good. I say good because I can get 5000 rpm out of it but there is an intermittent hesitation.