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Air fuel mix

Air mixes with the fuel

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My Rancher doesn't maintain high rpm. What's wrong?


Most 2-cycle chain saws have 3 carburetor adjustments; idle speed, low RPM fuel/air mix and high RPM fuel/air mix. The fuel/air mix needle valves will probably require a "special" driver tool to adjust them. Be careful with the adjustments, you can really mess things up by incorrectly adjusting them, then your saw goes from running poorly to not at all.

Apr 04, 2015 | Husqvarna , No.455 Rancher, 20" Gas -...

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Trimmer will only run for a few secs then dies out


First, use the same oil and mix it the same from batch to batch, once you have made a batch (gallon or what ever, never add gas or oil to make more, use up the batch to the last drop, then make a new gallon). Be sure the air filter is clean, some are weted with oil to catch more dirt and provide a bit of extra suction, clean and spray it with a spray cookingoil or soak it in oil fuel mix. Next: Look for 3 adjustment screws on the carb. should be three total. 1 screw is for idle adjustment. the other 2 should be close to each other, one is low speed fuel/air mix and the other is high fuel/air mix. Adjust the low fuel/air mix screw until it will idle un-added with the throttle then adjust the idle on the throttle to get a good idle speed. Next adjust the High fuel/air mix until it gets the RPM's you want it to have. It should go from idle to high speed with out hesitation or cough. It should also run with power to cut any weeds or limbs with out bogging out.

on May 30, 2010 | Garden

1 Answer

What type of gas to use in a craftsman edger 358.773110


FUELING ENGINE This engine is certified to operate on unleaded gasoline. Before operation, gasoline must be mixed with a good quality 2-cycle air*cooled engine oil. We recommend Craftsman brand oil. Mix gasoline and oil at a ratio of 40:1 (A 40:1 ratio is obtained by mixing 3.2 ounces of oil with 1 gallon of unleaded gasoline). DO NOT use automotive oil or boat oil. These oils will cause engine damage. When mixing fuel, follow instructions printed on container. Once oil is added to gasoline, shake container momentarily to assure that the fuel is thoroughly mixed. Always read and follow the safety rules relating to fuel before fueling your unit.

Sep 12, 2011 | Craftsman Garden

1 Answer

The light Check engine is ON


Here are some very common causes for the engine light to com on.

1. Low fluids, make sure all of your fluid levels are where they should be, particularly the oil.

2. MAF, ( mass air flow ) sensor. This controls the fuel/air mix ratio to the engine.

3. Oxygen sensor, there are 2, ( front means before the catalytic converter, back means after the catalytic converter ) The front measure fuel/air mix, the back measure the emmisions from the fuel/air mix and tells the computer what adjustments need to be made to the fuel/air mix ratio.

I hope this helps you.

Feb 02, 2011 | 2007 Toyota Corolla

1 Answer

Backfiring gets worse after warming up and oulling choke either half way or all of the way makes no difference


Hi and welcome to fixya,

Backfire can occur from too much fuel mixture. make sure your fuel-air mixture is correct. Have you done modifications on its jets? If yes, make sure you are using the default (or correct) jet size. Clean filter, make sure your spark plugs are also clean- if old, better replace it.

Fuel air mix is usually set 3.5 turns out for a medium mix, 2.5 for a rich mix, 4 turns out for a lean mix.
Pulling the choke will rich out the mixture so i suggest not pulling it.

Hope this info helps

Jan 04, 2011 | 2001 Yamaha V Star 1100 Classic

1 Answer

Keep burning up piston on exhaust side of 066 stihl on second jug and piston i know oil mix is right running three other stihl saws on mix


It sounds like you are running lean. Not a lean oil/gas mix but a lean Air/fuel ratio. This engine runs hot as a high performance engine. any air leaks such as crank seals, manifold gaskets or muffler gaskets can give you too much air for the fuel coming in.

Secondly from the fuel side:
Ethanol (curse it) combines with oils that have no nondispersants making a white chalky poweder in the fuel system causing less fuel to mix with air. any blockage or pin hole leak can cause less fuel to be brought into the engine thus less cooling and lubricating.

Your carburetor and fuel filter need to be serviced and adjusted correctly or they will affect the mix.

When done the engine should run no faster than 13,000 rpm top no load speed.
This engine should idle smoothly at 2,500 with no more than 150 rpm change

if the speed is not as listed above when the rebuild is done you need to go back into the machine.

Call up a shop like www.arcolawn.comto get a EDT8 tach. it is well worth the money.

good luck

Joe

Nov 14, 2010 | Stihl Chain Saw Handle Models 064 066...

1 Answer

How to adjust idle on McCulloch Mac 2214av chainsaw


Look for 3 adjustment screws on the carb. should be three total. 1 screw is for idle adjustment. the other 2 should be close to each other, one is low speed fuel/air mix and the other is high fuel/air mix. Adjust the low fuel/air mix screw until it will idle un-added with the throttle then adjust the idle on the throttle to get a good idle speed. Next adjust the High fuel/air mix until it gets the RPM's you want it to have. It should go from idle to high speed with out hesitation or cough. . Start with 1 1/2 turn out from all the way in. Be sure the filter is clean, You can use starting fluid or old school lighter fluid to aid starting if has been sitting for some time.

Oct 10, 2010 | Garden

1 Answer

What can I do about air not mixing properly in the injectors? How can I check this & what will be needed to fix problem?


The air dosen't mix in the injectors. The injectors spray atomized fuel directly into the cylds . The air comes in through the intake and is mixed in the intake manifold or cylds. The computer and sensors regulate the amount of fuel to air intake . Did you check ror any codes . Is engine light on?

Oct 07, 2010 | 1996 Lincoln Mark VIII

1 Answer

Just rebuilt carbs, the bike starts but i have to hold my hand a little over the top of the air box,seal around carbs and air box seem tight what could it be? the bike says on top of the back fender no...


First is your choke open or closed when you startthe bike.Try adjusting your carb a/f mix as you are running rich (high fuel mix ratio). Good enough?

Apr 25, 2010 | 1992 Suzuki GS 500 E

2 Answers

Do i have to mix 2 stroke oil on the gas for the 4 stroke bikes or just add regular gas on the tank? if is what is the scale for the mix?


DO NOT mix oil in the gas on your four stroke engine. You will foul the spark plug(s), build up deposits on the valves and head, and make a smokey, smelly mess. A two stroke engine uses the fuel/oil mix to lubricate the engine before being used as fuel. A four stroke engine has a separate lubrication system and does not normally burn any oil. As the name implies, a two stroke engine works in two strokes. The first stroke is downward, where the fuel/oil mix and air are drawn into the cylinder. The momentum from the crankshaft counterbalance or force from the other cylinder(s) drive the piston back up compressing the mix, and the spark plug sparks at or slightly before the top of the stroke. The rapid combustion of the fuel/oil/air mix drives the piston down, which is the power stroke, and then the cycle starts all over again. A four stroke engine has an intake stroke down taking in the fuel/air mix, a compression stroke up, a power stroke down as the fuel/air mix is ignited at or before the top of the stroke, and a exhaust stroke up before starting all over again. A four stroke is much cleaner and more reliable than a two stroke, but it is heavier and has less torque. A two stroke engine is much lighter and has more torque, but takes more maintenance.

Feb 28, 2009 | 2003 Yamaha YZ 250 F

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