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McCulloch chain saw. MCC1840B. 40cc. Will start but runs wide open with no throttle. Dont see any adjustments screws on carb. Could it be a air leak?? thanks

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Hey mate,

Yes it definately sounds like you have a air leak or the unit is starving for fuel...

Check over your fuel filter flush it out also if you can see it check the gasket and intake manifold for cracks or leaks after that if you are confident you can clean out the carby.

If none of that works then i would say one of your crank seals or base gasket is leaking and being that model they are not the easiest saw to work on and would reccommend taking it to your local small engine repairer...

Hope this helps
Kind Regards
Brad

Posted on Feb 05, 2010

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1 Answer

Hi, I have a Mac-3200 and need to know where to set the 3 carb. screws at. T, low and high I don't have a manual Thank you. Z-man


Most guys adjust them 'by ear'. Warm up the saw (hopefully you can get it to start), and set the high speed by opening the screw until it sounds like it is 'burbling' at wide open throttle. DO NOT adjust until it is screaming at its highes attainable rpm !!!! If you do, the mixture will be so lean it will damage the saw under repeated heavy load. Leaving it 'burble' at WOT (wide open throttle) will ensure that proper lubrication will be available in the cut. Under load, the burble will disappear and the saw should pull strong and not overheat, damage the piston or score the cylinder wall.

Next set the low speed screw until there is no hesitation in rpm increase when the trigger is pulled. Some suggest setting the low speed first then the high speed so you may have to readjust the high speed once the low speed is done.

The idle screw should be adjusted to where the chain is NOT rotating the guide bar at idle. If it continues to move, the idle is too high.

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1 Answer

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The "L" is your idle setting and the "H" is the wide open fuel setting. After the engine starts and runs a minute adjust the "L" to the smoothest run setting the go full throttle and adjust the "H" the same way.

Hope this helps.

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1 Answer

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Make sure the air cleaner is not plugged. Turn both jet screws CW to stops (lightly), then back each out 1-1/2 turns CCW. This is a basic setting and should allow the engine to start and run. When the engine is warmed up, pull the throttle full on and adjust H jet needle CW until the engine starts to speed up, but still 4-stroking. Correct adjustment is when the engine 4-strokes running free, 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 the engine should 'follow the throttle'. It will tend to 'gasp' when pulling the throttle if you have gone too far. Idle speed screw should be set so that the chain doesn't try to turn, but the engine continues to idle. Hope this helps!

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1 Answer

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Set both the high and low speed screws from lightly seated to 1 1/4 turns out. This will give you a rough setting that will allow the saw to start and idle. Set the idle screw to where the chain just stops moving at idle.
With the saw warmed up adjust the low speed screw out until the saw smokes a bit and acceleration is sluggish. Bring the screw in small steps until the hesitation is gone from the acceleration...you may need to adjust the idle again after this.
Now hold the throttle wide open and while it is wide open adjust the high speed screw in until the noise becomes smooth and the saw "sings". Do not leave it at this setting as it will burn down in short order. Once the saw is singing back the screw out until you can hear the saw's tone "roughen"....then back the screw out a tad more for good power / fuel under load.
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1 Answer

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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!

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Make sure that the air cleaner and muffler are not plugged. Check the carburetor screws and nuts for tightness. After turning both needles CW to stops (lightly), back them out CCW 1-1/2 turns each. Start the engine and allow to warm up. Open the throttle and adjust the H needle CW somewhat until the engine speeds up, but is 4-stroking. Correct adjustment is when the engine 4-strokes, but immediately 2-strokes when cutting. Release the throttle and adjust L CW till the engine runs fairly smoothly, but allows the engine to 'follow the throttle'. Set the idle speed screw so that the chain doesn't turn, but the engine keeps running. Hope this helps!

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1 Answer

I can't get the idel set on the McCulloch Mac130 chain saw. It runs wide open. When you try to idle it dies out.


Try turning the L needle CW to stop (lightly), then back out CCW 1-3/4 turns. Turn the idle speed screw CW about 1 turn. Start the engine and let warm up. Set the idle speed screw so that the engine keeps running but doesn't pull the chain. Turn the L needle CW until the engine runs fairly smoothly, yet allows the engine to 'follow the throttle'. Make sure the H needle is adjusted at full speed for 4-stroking, but immediately 2-strokes when starting to cut wood. If the above idle mix (L) adjustment doesn't help, you will likely need to clean the idle jets within the carburetor. Hope this helps!

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1 Answer

I get it started it runs as long as you have it wide open but you let of the gas it dies


This might require adjustment of the hi speed carb screw, the lo speed, and the idling screw as well.
The engine needs to be good and warm, you need to be certain you have a fresh fuel mixture in the tank, and you should check the air filter because it too affects the way the saw will run at low speed and idle.

I would start with the hi speed adjustment screw since wi does start. Fire it up and run it a bit to make sure you have it warmed up.

You may need someone else to help you hold the saw while you make these adjustments. With the throttle wide open, turn the hi speed screw slowly, in increments of 1/4 turn, to the left. It may be just a bit off. The objective here is to turn one way until it sputters or runs a little rough. Then turn it the other way until the engine smooths out. Continue to turn in the same direction until it again runs rough. Then turn back about halfway between those two points.

It should run well at wide open throttle. Place your screwdriver in the low speed adjustment screw and turn to the left, in small 1/4 increments like you did before. The objective here is to adjust to the point where the saw will throttle up quickly and smoothly, and more and more from an idling position, or as close as you can get.

If you find you don't get that, and the ramp up is choppy and unsmooth, adjust in the other direction. Eventually you should get to a point where you have quick response to your throttle. You should get to a point where it runs without being wide open.

If it fires up easily and throttles up smoothly but won't idle, the you need to adjust the idling screw. Adjust it until the chain begins to move on the bar when you let the throttle go. Once you get to the point where it idles with the chain moving, back off the adjustment until the chain just stops moving.

Make sure the air cleaner is clean. You may have to clean the carb with spray carb cleaner while it is running at full throttle. If you do, spray a tiny bit at a time, as it will almost kill the engine.

Finally, after all this work, invest in a new spark plug, even if the one in it isn't that old.

Sirwriter

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1 Answer

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