Question about McCulloch 26cc Gas Blower Mcb3208

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A good place to start is 1 1/4 turns out. If you have to go more than 2 1/2 turns out, there is another problem. If you have 10% ethanol gas in your area, expect to be replacing the diaphragm in the carb and fuel lines every 3 years or so.

Posted on Aug 23, 2010


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Which screw is feul setting screw and which is air setting one screw adjesting with spring which is that?

You have me concerned because you didn't even say carburetor...

So I am going to assume it...
and what make of vehicle (year?)... let alone the make or style of your "fuel" screws...

but to answer your question it really is unimportant.

Air-screw is always associated with the throttle shaft... the adjusting of the primary screw rotates the position of the plates on the throttle shaft exactly the same as the gas pedal does.

The fuel screw is usually pointed to the center of the air stack... if it is a two barrel (2 air stacks) there will be two identical screws.

These screws interface with a very soft and delicate orifice... and must be treated with the highest care not to damage that orifice! Never over-tighten those screws!!

Adjusting is an acquired ART... but everybody has to start at the beginning! As long as you are gentle you may soon get the hang of it.

Always set the SPEED with the idle screw first... Then adjust the FUEL with the idle screw...

Gently turning it out to see if the RPMs increase... slowly screw them in (closed) until the motor speed drops ... back it out about a half turn... and again set the AIR screw for the correct RPMs.

You are probably pretty good there but if you want the best/smoothest idle mixture... again repeat the Fuel screw screwing it in... until the speed drops.

Again back it out a half turn and you should be done.

Just always remember that idle screw is last... Change in anything else... especially the timing... points gap... air screw... always finish with the idle adjustment.

Good luck

Nov 15, 2015 | Cars & Trucks

1 Answer

How to adjust carb on 1997 seadoo ? \

You should adjust the idle screw to get the proper idle speed and then whether an air or a fuel ratio screw from a starting position of about 3 1/2 turns out from lightly bottomed with the engine idling you would back it out further until it just starts to miss or drop in rpm and then back in until it just starts to miss or slightly drop ion rpm and then find the mid point between the two and/or back it out to the midpoint and then until more you get the highest smoothest rpm and turn to enrichen it just slightly

Sep 16, 2014 | Motorcycles

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My craftsman chainsaw is pretty new, and it isn't starting properly. When it does start, it has a tendency to cut out during use. I adjusted the idle time, a few times, cleaned the air filter, and checked...

There will be three screws on the carb, the tick over screw, a L screw which ajust the mixture from idle to half throttle, ans a H screw which adjusts the fuel running speed, they are both fuel screws not air screws, start with a basic settinf of one and a half turns on each from closed, with the saw idling gently screw the L screw in, the revs will start to increse as the mixture weakens off, it will reach a point where it starts to die, at this point start unscrewing the L screw, the revs will increse again and then start to die because its too rich, now turn it in 10 minutes on a clock face, check that it revs cleanly,adjust the idle screw so as the chain does not rotate around the bar, the H screw controls the max rpm, this should be set with a rev counter, it should not exceed 12500rpm

Apr 21, 2011 | Garden

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I 've had this brush cutter 3046yb aprox 1 year and when i put the brush cutter on and start it, it keep stopping i leave it for 5 mins to warm up and it still stops as soon as i touch the thottle

Hi John, this is probably a carburetor adjust issue, but it could be something else like an air leak, plugged air or fuel filters or lines. A possibility could also be venting of the fuel tank. This is usually done by a one way valve in the gas cap. The carburetor itself could be causing this problem, and might need cleaning or a carb kit. Try adjusting the mixture screws that could be the problem. When adjusting needle screws turn 1/8 of a turn at a time. Start by adjusting the low (idle) speed mixture screw 1/8 turn out (counterclockwise) to add more fuel to the mixture (make sure you remember the start position). Start your brush cutter and see what happens. If you have to, do that procedure 4 or 5 times. If not any better, return the screw to it's starting position. You might try turning the screw in (clockwise) a few times and see what happens. For your info (the manufacturers suggest to adjust both the high and low mixture screws 1 turn out from a lightly seated position as a starting point to adjust carb. This is very often just right, but if adjustment is necessary it is usually not by much). If the low speed screw adjust has no results, try the same with the high speed screw. I hope this helps a little bit. Get back to me if you have any questions. All the best and good luck.

Feb 15, 2011 | Ryobi Garden

2 Answers

I have a huskey chinesaw model 50 trying to adjust carb but haveing no luck what is the proper adjustment please help

Hi, Gerald I will try to help. The high speed mixture screw basic setting is about 1 1/4 turns out from lightly seated position and the idle or low speed mixture screw is about 1 turn out from lightly seated position. To get the manufacturers basic or start out setting, remember the position of the screws before you start any adjustments. Both are done the same way. Turn adjust screw in or clockwise until lightly seated (so the soft metal is not damaged when seating the screw) then turn out or counterclockwise, high 1 1/4 turns and low 1 turn out. Do any adjustments in 1/8 turn increments until you get running. Do not turn the high speed mixture screw so there is less than 3/4 of a turn from seated position, The reason is not to run the engine too lean so engine does not overheat. When turning the screw in, there is less gas in the mixture, therefore when turning out you allow more gas in the fuel to air mixture.
The problem might not be adjustment, it could be many other things causing it not to run properly. Make sure the air filter is clean, the fuel filter in the tank is not plugged up. Spark plug might be fouling up, the fuel lines might have dirt or starting to go. The fuel tank is usually vented by the tank cap and might be plugging up not allowing enough air in. Check the bolts screws and gaskets of the carb so there is no air leaking in.
The carb might need an overhaul, cleaning and maybe a carb kit.
These are suggestions to help diagnose the problem. I might have forgotten other things to check out. I hope this helps you out a bit. All the best and good luck.

Feb 06, 2011 | Husqvarna "Chain Saw - 16" Bar, 3 Hp

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Need a manual or something I have a traxxas .15 stamped 2wd need to adjust the Carb it has 2 screws need to know which one does what and what would be a standard adjustment

There are actually 3 screws on the carb. The big one is the most important, it adjust the high speed fuel mixture. A good starting point is 2 1/2 turns out from fully seated. There is a small screw which is located right next to the air intake. This is the idle stop and should be set so that the engine idles smoothly. The third screw is located on the side. It is also small and it controls the idle fuel mixture. A good starting point for the idle fuel mixture screw is 1 3/4 turns out from fully seated.

Dec 16, 2010 | Traxxas 4910 T-Maxx RC Monster Truck

1 Answer

1990 Yamaha PW 80 air/fuel adjustment

Hi, Stevewright3 it should be noted that the "AIR FUEL" mixture screw adjustment "ONLY" manages your idle and has no effect on any other circuit also any intake leaks must be repaired before the A/F adjustment procedure can be performed otherwise you will never obtain a proper idle and you will waste a lot of time chasing the impossible. The A/F mixture screw's purpose is to fine tune the fuel charge entering the combustion chamber. The following applies to both 2 and 4 stroke engines:
1. The mixture screw may be sealed at the factory with a Welch Plug please review the following video for removal.
2. The mixture screw manages a range of 3 complete 360-degree counterclockwise turns from the bottom/closed position.
3. The mixture screw should have a spring and o-ring for tension and sealing integrity.
4. Turn the mixture screw clockwise until it gently bottoms out, this makes the fuel charge very lean and the engine should not idle if it does then the pilot/idle jet is too big and needs to be replaced with the next size smaller.
5. Turn the mixture screw 1 and 1/2 turns counterclockwise to establish a baseline for starting the engine.
6. To fine-tune the idle circuit, adjust the mixture screw 1/4 turn in or out to achieve maximum idle RPM, wait 15 seconds between each adjustment for the idle to settle.
7. Never go past 3 full turns out this will make the fuel charge rich, foul plugs, and produce black smoke out of the exhaust, if the engine RPM keeps increasing past 3 turns the pilot/idle jet is too small and needs to be replaced with the next size larger.
7. After achieving maximum idle back out the mixture screw another 1/8 of a turn then adjust the throttle cable idle stop screw to 950-1050 RPM.
8. This procedure works great on 99% of all engines, for the 1% that demand a more robust throttle response on aftermarket monster fuel delivery systems additional tweaking outside the box may be necessary.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
PW80 oil gas ratio and stock screw settings
YAMAHA PW80 Owner Manual Adjusting The Carburetor Adjusting The Engine...
YAMAHA PW80 Owner Service Manual
OEM parts for Yamaha
YAMAHA PW80 Owner Manual

Aug 15, 2010 | 2004 Yamaha PW 80

1 Answer

How to adjust carbs i screwed the throttle screw in all the way and lost track how many turns it was now it will not start

you should have 3 adjustment screws. the one marked T is throttle idle position,adjusts idle speed.Lo adjusts air-fuel mixture at low rpm,HI at high rpm.H & L should be 3/4 to 1 1/2 turns out from a lightly seated position.adjust for best rpm's at Lo,then Hi.turning idle screw in too far would not affect starting,only idle speed.

Sep 28, 2009 | Garden

2 Answers

3.5 HP briggs starts and idles but dies when fuel is advanced

Get a carbeurator cleaner which u can add to the gas. Let this new mixture run in the mower for ten minutes and it should clean up your problem.

Aug 06, 2009 | Garden

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