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How do I adjust the H and L needle valves so that the hdegetrimmer will continue to run

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How do you adjust idle speed 1991 johnson 100 hp


not important, what's important is that they are absolutely clean, including the four brass high speed jets located in the bottom center portion of the carburetor.

That model engine's carburetors has fixed jets, BUT if the slow speed jets are adjustable, earlier model carburetors have been installed. If so...................

The four adjustable needle valves control the flow of fuel in relation to the set air flow, adjusted as follows (if needed).

(Dual Carb V/4 With 4 (2 each carb) Slow Speed Adjustable N/Valves)
(J. Reeves)

The adjustment procedure of the carburetor slow speed needle valves follows. NOTE... if the needle valves turn too freely, replace the nylon bearing retainer (the nylon item at the front of the carb that the needle valve goes through first) with the newer type RED retainer #315232. If your engine has that weird linkage that connects all four of those needle valves, the newer RED retainers will enable you to discard that linkage. The RED retainers make it impossible for the needle valves to vibrate out of adjustment.

(Carburetor Adjustment - 2 Slow Speed Adjustable Needle Valves, each carburetor)

Initial setting is: All (4) Slow speed valves = seat gently, then open 1-1/2 turns.

Facing the carburetors, start with the top left needle valve, then the top right valve, then the bottom let valve, then the bottom right valve. It may be necessary to redo these steps to get the adjustments ideally set

Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running.

Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

Do not attempt to gradually adjust all four of the valves at the same time. Do one at a time until you hit the above response (die out or spit back), then go on to the next valve.

When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.

Jun 28, 2017 | Cars & Trucks

1 Answer

Toilet runs slightly, can minimally depress the handle to release a bit of water, and it will stop. How to fix?


Toilet runs continuously or doesn't flush adequately

Jiggling the handle might work for a while, but if your toilet is always running or doesn't flush adequately, you need to perform these simple fixes that usually can tame a noisy, inefficient toilet.

Check the Chain

The chain attached to the rubber flapper often becomes loose, causing incomplete flushing and/or continuous running. To fix it, remove links from the chain using needle-nosed pliers until it's tight.

Check Water Level

Improper water levels can also cause problems with your toilet. This can be fixed by adjusting the ball ****, which is located next to the overflow pipe, the open tube to the right of the handle. Adjust the ball **** so the water comes to ½ " below the overflow pipe.

Clean the Surface of the Flush Valve

A continuously running toilet can also be the result of a faulty flush valve. Because the valve is made of rubber, it can decompose or warp allowing water to escape from the tank into the bowl. Clean the sealing surface to see if this will improve the seal. If too decomposed or warped the valve may need to be replaced.

Replace the Flapper

Remove old flapper and replace with a suitable replacement. Attach the flapper to the overflow pipe inside the bowl. Then attach the lever chain from the flapper to the handle lever making sure the chain is taut.

This video will help familairaize you with the flushing mechanism and the repair:

Dec 18, 2010 | Toto Drake ADA Compliant Toilet with...

1 Answer

Need to know what the setting is for needle valve on a 460. I increased the gap when I was trying to fix a problem of running too lean. Fix the problem, but messed up the needle valve. The problem was the...


Turn both H and L jet needles CW to stops (lightly), then back out 1-1/2 turns each CCW. This is a basic setting and will be rich. Start the engine and allow to warm up. Pull the throttle full on and turn the H needle CW until the engine starts to speed up, but continues to 4-stroke. Final adjustment is when the engine 4-strokes at speed with no load, but immediately 2-strokes when cutting. Release the throttle and allow to idle. Turn the L jet needle CW until the engine idles fairly well, but still allows the engine to 'follow the throttle'. Idle speed screw should be adjusted to keep the engine idling, but the chain should not try to turn. Hope this helps!

Dec 15, 2010 | Husqvarna Chain Saw 20" Bar

1 Answer

I have a 1980 poulan 4200, starts and runs, but no power and 'chugging' when throttled. replaced fuel line, rebuilt carb, no exhaust obstructions, compression is okay ~130psi what's next? Dan


Air cleaner may be plugged. This sounds like too much fuel going into the engine. When you serviced the carburetor, did you replace the diaphragm in the lower chamber and check the needle valve that the diaphragm operates? Did you clean or replace the fuel filter in the tank? If everything has been taken care of, turn both jet screws CW to stops (lightly), then back each out CCW 1-1/2 turns. Start the engine and allow to warm up. Pull the throttle full on, and turn H jet needle CW until the engine starts to speed up. Proper final adjustment is when the engine 4-strokes, but immediately 2-strokes when cutting. Release the throttle and adjust L jet needle CW so that the engine idles fairly well, but will allow the engine to 'follow the throttle'. Adjust idle speed screw so that the engine continues to run, but the chain does not try to turn. Hope this helps!

Nov 04, 2010 | Garden

1 Answer

Poulan chainsaw model #2550 Serial # 99246D100255-3 Carburator adjustment floods out will not start


Check the fuel filter, air filter, and muffler for plugging. Check the carburetor lower chamber diaphragm for flexibility and no damage. Also check the needle valve tip that the diaphragm controls for any damage or wear. If still flooding, turn both needle jet screws CW to stops (lightly), the back each out CCW 1-1/2 turns. This is a basic setting which should allow the engine to start and run.
Start the engine and allow to warm up. Pull the throttle full on and adjust H needle CW till the engine starts to speed up, but still 4-stroking. Correct adjustment is when the engine 4-strokes unloaded, but immediately 2-strokes when cutting. Release the throttle and adjust L needle CW for better idle but allows the engine to 'follow the throttle'. Adjust idle speed screw so that the chain stops turning, but the engine continues to run. Hope this helps!

Aug 14, 2010 | Poulan Pro 42CC 2 Cycle Chainsaw, 18"

1 Answer

How to adjust carby settings after rebuilding. McCulloch Eager Be


Turn both jet needles CW to stops (lightly), then back out each CCW 1-1/2 turns. This is a basic setting that should allow the engine to start and run. Start the engine and allow to warm up, then pull throttle full on. Adjust H needle CW until the engine starts to speed up, but continues to 4-stroke. Proper setting is when the engine 4-strokes unloaded, but immediately 2-strokes when cutting. Release the throttle and adjust L needle CW for better idle, yet allows the engine to 'follow the throttle'. Adjust idle speed screw so that the chain stops turning, but the engine continues to run. Hope this helps!

Aug 01, 2010 | McCulloch Garden

1 Answer

My chainsaw starts with choke when choke is off and i press trigger it just dies like its getting no fuel


Check the fuel filter, muffler, and air cleaner for plugging. Check the condition of the fuel lines for hardness, splitting, end rot, or kinking. Make sure the carburetor fasteners are tight. If no help, remove the lower carburetor chamber cover and examine the diaphragm and fuel metering valve that it controls. The diaphragm should not be hard, cracked or have any holes. The fuel valve has a rubber tip that may have deteriorated. If looks ok, then turn both L and H jet needles CW to stops (lightly), then back out CCW 1-1/2 turns each. Engine should start and run with these basic settings. Allow the engine to warm up, then pull the throttle full on. Adjust H needle CW until the engine speeds up somewhat, but is 4-stroking. Correct adjustment is when the engine continues to 4-stroke, but immediately 2-strokes when cutting. Allow to idle, and adjust L CW until the engine runs fairly well, but will allow the engine to 'follow the throttle'. Set idle speed screw so that the chain stops moving, but the engine continues to run. Hope this helps!

May 17, 2010 | Garden

1 Answer

Dies when i give it gas


Sounds like your carburetor either needs cleaned or the needles need adjusted. Try turning them just a bit and continue trying to accelerate the engine. If your carb has adjustable needle screws, one will be the low speed adjustment and the other will be the high speed adjustment. You'll know when you have the right one when the motor starts to run just a bit better after adjusting the correct one.

Nov 14, 2009 | Garden

1 Answer

Carb and valve adjustment


Dear Craig,
Presuming that the carb is clean !
It seems that you have either set the float level incorrectly, or allowed the needle to become jammed. The float bowl should a little less than 3/4 full of fuel when the fuel is shut off by the needle and seat.
Check that the needle and seat are working correctly by blowing in the fuel pipe, and then closing the needle by hand. Check that the flow is stopped when the needle is fully raised.
The needle and seat do need to replaced from time to time, but generally last well.
If the needle and seat work, then look at the float level.
Further check to see that the floats are not filling with fuel. If this is the case, then the floats will have to be replaced as most repairs are only temporary.
When the floats are fuel logged the needle will not be raised and fuel flow to the carb will be continuous.

Feb 14, 2009 | 1996 Honda XR 600 R

1 Answer

Adjusting carb on husqvarna chain saw


Hi First turn them(H and L) clock wise until the end and then adjust.

high speed H=3/4 turn

lowspeed L=1 1/4 turn

idle speed T adjust accordingly

best regards savumihai71

Jan 19, 2009 | Husqvarna Chain Saw 20" Bar

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