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Fuel mixture for mac 3227 trimmer

No idea how old it is mod 3 is B 40013200

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Mixture ratio for most trimmers and small engines will be 25 to.1 through to 50.to 1. It iiright when there is just a sight of blue smoke when operating
around 30 to 1 will be a good place to start

Posted on Apr 07, 2015

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Posted on Jan 02, 2017

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Hi my McCulloch mac 70 keeps loosing power,I have changed the fuel filter,spark plug and air filter the mixture is right but still won't run right,any ideas?many thanks Barrie.


Check the muffler for any type of obstruction first. Then I would check the diaphragm in the carburetor to make sure it isn't starting to stiffen up. If that doesn't help it may be that it is just old and tired

Jan 16, 2013 | Garden

1 Answer

Starting mac 3227 trimmer


As you have done most things, i would suggest you have a massive air leak, either through the cylinder or crankcase gasket, or through the crank seal, i think its time to pull the whole engine down and replace these items.

May 29, 2012 | Garden

1 Answer

My MAC 3227 trimmer will start an only run for a short time (less than a minute). It needs for the chock to be in the half chock position to start. If I move the chock to non-chock it stops. If I...


remove the carburator.. It's plugged.
disassemble and soak the body in fresh gasoline for about 10 mins.
Blow out all the ports with small engine carb cleaner and reassemble.
Drain the gas tank , clean it and refill with fresh gas mixture
It doesn't take much to clog those little carbs

May 23, 2011 | Garden

1 Answer

Has been sitting for a few years.. cleaned carb and chedcked settings on H and L screws.. still wont start.. replaced fuel lines and primer bulb.. and its a mac 3227 weedeater.. cranks but doesnt start,...


siphon out the old fuel and put brand new fuel in the tank. Change the air filter even if it looks ok. Put in a new spark plug. Then get a can of starter fluid and an assistant. Squirt some starter fluid into the air intake and start it up. have your assistant continue to spray the starter fluid for a minute or so until it runs on its own. J.

Sep 30, 2010 | McCulloch Garden

1 Answer

Idles just fine. Stalls when you press the gas. Trimmer is 5 years old. Choke operating alright. Fresh gasoil mixture. appears to be a fuel problem like it is not getting gas.


make sure you have correct fuel mixture per recomendations also some gas models have a filter (screen) that is made for models sold in california and it will become plugged. Take out the screen. Check manual to see if have one

Jul 06, 2010 | Garden

1 Answer

How ajust carburator on a McCulloch Mac 3227 gas trimmer


If the trimmer is made for US the carb is not to be adjusted.

Jun 08, 2010 | Garden

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My weedeater want start change spark plug


I would have a cylinder compression done on the engine before spending any more money. It may be below 100 psi and will not run. Plus if your fuel mixture is over 30 days old I would mix up some fresh fuel mixture.
Or the diaphragm in the carburetor has become stiff and is not pumping any fuel.
Good Day.

Oct 12, 2009 | Poulan WeedEater Hedge Trimmer 25cc Engine

1 Answer

Erratic idle, goes up and down constantly


You may try mixing up some fresh fuel mixture at 40:1 ratio(3.2 oz 2 cycle oil to 1 gallon of gas). It sounds like old fuel mixture. The schools I have been to this year all manufacturers have told us gas over 30 days old is considered bad gas.

Oct 02, 2009 | Garden

1 Answer

I have a Mcculloch Model Mac 3227 whipper snipper. I am wandering how to tune is so it does not over rev when on idil.


There should be a "HI" and a "LOW" setting. There should also be an adjustment for the idle speed. Each would have a screwdriver head on it . Look closely. You would adjust the idle setting, not either marked H or L...Lee

Sep 17, 2009 | Garden

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