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Mcculloch M51 550CMD

Only just starts just about runs, put new plug in but poor spark, cleaned carburetor and tank with air line, filtered fuel still the same just chugs away. Its as though the fuel is not getting through air filter is clean, any advice would be appreciated, John.

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1 Answer

I would check the compression may not have enough to run it or the muffler may be clogged up check both

Posted on May 13, 2014

  • Dave Vuckovich May 19, 2014

    If the fuelis more than 2months old dump it and put in fresh fuel.



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Posted on Jan 02, 2017

  • 2220 Answers

SOURCE: Echo pole saw boggs aand wont reach high rpm. I

If you must choke it for it to run it is lean. Have you attempted a carburetor adjustment? Start with "H" and "L" at 1.5 CCW from lightly seated. Then try this:
Carburetor Adjustment by
CW is leaner; to lean will destroy the saw. If over tightened closed (CW) the adjustment screw faces are easily marred; marred adjustments are difficult to impossible to set properly.
Clean the air filter; adjusting with a dirty filter can cause a run lean condition once cleaned and the saw run.

There are 2 wav (sound - idle & full – not highlighted) files that I find most helpful, I think you will too.

An air leak where the carburetor bolts to the engine or the intake manifold can also cause this. If an adjustment does not or has not fixed this I suggest you try your friendly neighborhood Stihl shop. Explain everything you have done to a mechanic there. Good saw shops pressure test the crankcase, fuel lines, and intakes. They have test equipment homeowners do not. Explain what you have already done and ask for a repair estimate. I think you will be pleasantly surprised. Not all small engine mechanics are created equal... why I recommend Stihl. The odds of finding a good mechanic at a certified Stihl shop are in your favor. If not already using 50:1 fuel mix, please ask the Stihl shop what they recommend. Echo on their site has a statement equivalent to "regardless of what your manual says use 50:1". HTH

Posted on Jan 03, 2010

Testimonial: "Thanks for the advice. I dont see any adjustment screws for high or low on this carb. Its on a ppf 210- Echo power pruner"

  • 72 Answers

SOURCE: Husqvarana Rancher 55 , how to clean the exhaust port

Cleaning the exhaust: on the saws I've worked with it was just to loosen two bolts at the front and then the exhaust is off the saw. Clean with brake cleaning fluid and blow with compressed air, let it dry before assembling. Don't forget to clean the fine mesh at the output side underneath the lid if present (i.e the spark arrestor).

Make sure to have your carb adjusted properly afterwards.

Posted on May 24, 2009

  • 491 Answers

SOURCE: I purchased a Stihl 036 chain saw at a yard sale.


Posted on Jul 20, 2009

  • 1 Answer

SOURCE: Have a McCulloch 3818 chainsaw.

Had this problem with my saw (3818) there are two adjustment screws on the side of the carb there is a hole in the plastic to get to them just fwd of the choke slide, not the idle adjustment which is farther fwd of the other. take a 1/8" flat head screwdriver, get the saw running and turn them ever so slightly till you can get a good idle, they only have a 1/2 turn of adjustment each, it doesnt take much

Posted on Jan 14, 2010

  • 332 Answers

SOURCE: Husqvarna 55 Chainsaw (1999) - Runs OK for 1 minute then stalls

I think your on the right track
Blowing compressed air through your tank vent
is great but it is way more air than the natural asperation
that the saw pulls on it own
I would replace the vent cap and also look for a pinched fuel line between the fuel tank and the carb

Posted on Apr 07, 2010

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New spark plug, fresh gas, clean air filter. Wont start.

take the fuel line off at the carburetor. if fuel is coming out then you have a plugged carburetor. take it off and apart. clean it really good with carburetor cleaner and put in a new needle and seat. it should run as good as new.

Apr 30, 2016 | Garden

1 Answer

Mcculloch 35cc won't start has run before put in new plug ran for 2 min would not restart

Hi Burt597

Make sure you are getting spark at the spark plug, to do this:
Remove your spark plug and check to be sure you are getting a bright blue spark at the spark plug.
You do this by grounding the plug on the head of the engine and pulling the crank rope...watching the plug for spark.
If you are getting a nice blue spark then skip A below and go to B.
A...If you do not get a nice blue spark then you may need to replace the electronic module.
Note: If you have to replace the module be sure to measure the position it is in and be sure to install it in the same position
Normally the clearance is around .10 thousandsands
Also write the measurement down on a piece of paper for later reference, this measurement is critical to starting of the engine later.
B...Also take some fine grit sandpaper (not emery) and lightly sand the flywheel where the magnet is located to clean any rust or corrosion from the magnet area.
You can also try to lightly sand the module metal face to increase the possibility of ignition of the old module before replacement.
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Sounds like you have dirt/debris in your caburetor jets,fuel passages or a diaphgram that is becoming non-flexible.
Check/Clean/Replace your Air Filter, a dirty air filter can make your engine run to rich with fuel.
Also be sure to check and clean your spark arrestor in the exaust,if you have one installed on your engine.
Note:Before you disassemble the carburetor:
Write down on a piece of paper or take a picture of how the linkage attaches to your carburetor for later reference when you go to reinstall your carburetor.
Mark each piece with a awl, or some kind of instrument that will make an alignment scratch before you disassemble the carburetor into separate pieces.
That way you will know which way it goes back together when you reassemble it.
Sometimes you can get by with priming the carburetor or by using a very small shot of starting fluid and letting it run a few times like that, and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Be sure to check your fuel tank for water and dirt/debris, if there is water/debris then you need to clean your tank.
Check you fuel line condition after a while they will degrade and need replacment.
Check/Clean/Replace your fuel filter if you have one, normally they are located in the fuel tank of chainsaws and weedeaters.
When you remove your fuel lines from the carburetor be sure to make a drawing to how the lines are connected to the carburetor or take a pictue for later reference.
Normally the big line will be the line the fuel filter is connected to inside of the tank.The smaller of the two lines is the return to the fuel tank from the carburetor after it is pumped thru the carburetor by the primer bulb.
Make sure you are using fresh fuel...and oil if your using a two cycle chainsaw or weedeater with the oil to the right mixture...too much oil as it can cause hard starting and excessive smoking.
If the chainsaw/trimmer is over a couple of years old, then I recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
The diaphgram may look good and flexible, but it can be deceiving and not act as a fuel pump as it should because it has become too hard and will cause hard starting,start and run and shut off, etc.
When you clean your carburetor, I recommend that you use a laquer thinner type cleaner to clean and dissolve the laquer build-up in the float and needle jet passages.
Be sure to remove all plastic and rubber parts before using the laquer thinner because it can dissolve the plastic parts and render them unuseable.
Be sure to use COMPRESSED AIR to blow out all the fuel and air passages.The higher air pressure is needed to blow some of the trash/debris from the fuel or air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Keep in mind that the float (if you have one) for the carburetor must be level when you go to reassemble the carburetor or follow the instructions you get with the carburetor kit, or you could also ask the parts man that you get your kit from.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their original position before you started.
The little spring inside of the carburetor goes under the float arm.
That is where your fuel inlet needle/float valve is located...on the arm at the end.
Normally there is a small indention in the carburetor base and a small protrusion on the underneath of the float arm where the spring will be in the right postion for installation.
The spring will set in the indention and you will install the float arm with the needle/float valve and float rod into position over top of the spring,you will push down until it is in position and then you can tighten the screw that holds the float arm assembly in position.
Once you have your carburetor cleaned/rebuilt that should solve your problem.
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Oct 25, 2012 | McCulloch Garden

1 Answer

Echo srm210, hard starting, runs poorly, acts like it is starving for fuel, dies

I would start by checking the condition of the fuel filter and fuel lines and progress to the carburetor from there. Make sure muffler is clear and air filter is not clogged. Your symptoms have all the signs of a dirty carburetor. Post back after checking condition of fuel tank, fuel filter, fuel lines, muffler, and air cleaner, and spark plug also.

Apr 02, 2011 | Echo Garden

2 Answers

Will not start.

Check the chainsaws compression by putting your hand over the exhaust while slowly pulling on the string you should feel small bursts of air and feel resistance on the chain if not the cylinder most likely has lost compression and needs new piston rings.
Also, check that the spark plug is firing either with a spark plug tool (sold at many hardware stores or places like harbor freight). Or check it by removing it, connect it to the plug wire and touching the tip of the plug to a ground (the Finns on the cylinder or anything metal on the saw). Make sure you see a spark in between the two electrodes on the plug (do so in a dimly lit area as it can be hard to see). If there is no spark check the flywheel and magneto for any dirt or other material and clean it with a wire brush if there is no spark after cleaning the magneto, plug, and setting the plug you will need a new magneto.. Also make sure to check for dirt and carbon build up on the plug and use a gap tool and make sure the plug is set to the specs. on the manual (gap tool can be found at any hardware store) If you have cleaned the plug, properly set the gap, tested the spark, and have compression the problem is most likely a fuel delivery or fuel air mixture problem.
Make sure that the air filter is clean and free of any fuel/oil, moister, and dirt a dirty filter will foul operation.
Check the fuel tank for build up along with the fuel line and filter/strainer in the the tank if there is one. If you find alt of gum or particulates in the tank or line/filter clean them out with carburetter cleaner. You can also use starter fluid (sold at any hardware store) to clean the tank and lines and use it along with a clean tank/lines/carburetor. check the carburetor for build up by removing the bottom screw on it to inspect the bowl and carb float for residue. If you find thatr the carb bowl and float has particulates and other build up clean it with carb cleaner.
Also check the idle and running screws on the carb for proper adjustment the user manual will have the information to do so.

Jan 24, 2011 | McCulloch Garden

1 Answer

After starting and operating the chainsaw for a short time, it dies and I can't get it started again. Suggestions?

Engines require 3 things. Spark, compression and fuel. And chainsaw need 2-cycle oil mixed with the gas.

Assuming you have the right oil-gas mixture and a fresh batch of gas, and you didn't leave old gas in the saw all summer long since last November.

-Take off the dirty air filter and see if saw starts without filter. Do not run without putting in new filter.
-Check exhaust port for mud dobber home or screen clogged with carbon and dirt
-See if saw fires up after squirting WD-40 directly into carburetor
-Check gas line >>> pull gas line loose and see if gas flows out of tank to carburetor
-Take out spark plug > put finger over spark hole and pull cord >> do you feel suction that says you got compression?
-Put spark wire back on spark plug >>> hold spark plug so threads touch bare metal part of spark plug hole >>> pull starter cord and see if spark shows between plug and saw >>> suggest you not hold metal part of spark plug while pulling cord [you'll understand why]
-If spark plug shows spark, then your saw has spark ... so put in new plug and start fresh.

If your saw has compression, spark, and fuel it should start unless carburetor is gummed up because gas was left in tank.
Here is the final trick. Start the saw while spraying WD-40 directly into carburetor and see if you can keep it going with the WD-40. This might take a helper. If this does not work, then carburetor is bad or gas line is clogged at carburetor. Time to take it to the shop.

Oct 06, 2010 | McCulloch Garden

1 Answer

My Gas Powered Ryobi String Trimmer (RY26500B) won't start. What should I try??

Here are the basics. You need: spark, fuel, air, compression, and timing to make it run. Clean the spark plug. Inspect the fuel lines. Are the hard/brittle? Do they connect to the filter in the gas tank? Clean the air filter. When the spark plug is out, put your finger over the opening and gently pull the rope. Do you have compression?
Most common repairs needed are usually fuel lines and carburetor work.

Aug 20, 2010 | Ryobi Garden

1 Answer

Wont start it has fuel it is getting fuel, spark plug is good there is spark at the spark plug. as per starting instructions i did everything, it will not start. used it twice 55cc mcc1855fk model

Try putting some fuel mix into the plug hole and try for start. If it pops several times, then fuel is not getting from the tank to the engine. Check the fuel filter, air cleaner, and muffler for plugging. Check the fuel lines for decay or other damage. Make sure the carburetor fasteners are tight. Does the unit have a primer bulb, and does it fill with fuel when pumped several times? If it is an older saw, the carburetor may need to be cleaned inside and out with spray carburetor cleaner. Check the diaphragm in the lower chamber--it should be flexible with no cracks or holes. Does the engine seem to have good compression? Hope this helps!

Aug 11, 2010 | McCulloch Garden

1 Answer

Will not start

That seems to imply that the check valves in the primer pump and in the fuel pump section of the carburetor are bad or the air pressure just forced by the valves. The line without the filter is the tank return line from the primer pump. The primer pump is supposed to pull fuel from the fuel filter into the carburetor flooding all spaces within it it, then passing out to the primer pump and from there, back into the tank. Does the primer bulb fill with fuel after several pumps? The first try may take longer because you forced all of the fuel out of the carburetor with the air pressure. Make sure all of the carburetor fasteners are tight. It's possible that you have injured the diaphragm in the carburetor lower chamber when you blew air into the line. Go to: for a 12 page article on Walbro carburetor theory and troubleshooting. Make sure the spark plug gap is set at 0.020". Hope some of this helps!

Jun 22, 2010 | Homelite Consumer Products 9.0 Amp, 14 In....

1 Answer

Lawn mower will not start

check gas tank with light is there dirt in tank? did you change fuel filter? is there spark at the spark plug? try a 2 second spurt of starting fluid in carburetor and crank does it fire?if it does then you most likely need to clean carburetor with carburetor cleaning spray, flush fuel lines with spray and swap fuel filter.

Apr 23, 2010 | Briggs & Stratton Briggs Stratton Intek V...

1 Answer

I cannot get my Ms 1839 AV McCulloch chainsaw to start

So many places to start...As you have only provided only limited information.


-Drain all fuel from the Saws fuel tank.
-Remove and REPLACE with a NEW spark plug.
-Remove and RELPACE with a NEW Air filter.
-With spark plug and air filter removed and fuel drained pull the starting cord many times 12 or so to ensure there is no fuel in the chamber and also check for a spark at the plug.
-RE-MIX WITH NEW FUEL your 2 cycle oil to the correct ratio in a clean fuel can. it is OK to dump some in the Saws fuel tank slosh around and dump out in an approved container for disposal.

Refuel hold off on putting back on the air filter until you have had it running.

Hope this tip helps.


Jan 31, 2010 | McCulloch Garden

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