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My Flymo XLH550 will not start. I have cleaned the spark plug, and have a good spark. The fuel mix is good and is getting through. Any theories?

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Could be a timing issue, does it also have good compression.?

Posted on Aug 02, 2013


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Engine starts. Why does it only run a few minutes, then stop?

a few things may cause this. it sounds like it is starving for fuel. the spark plug may be breaking down when it gets hot. try a new spark plug. if the fuel and fuel lines are in bad shape, old, soft or hard. the fuel don't smell right. fuel filter plugged up. the carburetor may need to be cleaned and a rebuild kit as they are cheap. if it is 30 years old. be sure the fuel lines, filter and carburetor are in good shape. hope this gives you an idea on where to start. good luck

Mar 14, 2016 | Garden

1 Answer

Will not start someone put wrong flue mix in

You will need to drain the fuel tank and lines, to get rid of the wrong fuel mix. Remove the spark plug clean and dry it. Rotate the engine several times with the plug out, to get rid of some of the wrong fuel mix. Install plug, fill fuel tank with the right fuel mix and start using normal procedures. If it does not want to start, remove the plug and put a teaspoon of straight gas in the cylinder. Install spark plug and try to start unit. You may have to remove the plug more than once and put gas in the cylinder.

Nov 13, 2015 | Garden

1 Answer

Hi i would just like to know if there is a common problem with the kx 65 I took my son riding today and the bike was running good then it stalled on him now it won't run I got it started for 5 sec then...

No common problems to the KX in particular but very common to all race bred 2 strokes is they all require lots of love and attention so clean air and pilot jets regularly clean air filters regularly make adjustments to the fuel air mix screws to suit time of day and altitudes etc regularly and if you ever have problems starting and stalling throw away the spark plug and replace as you no doubt would have fouled it and the plugs never return back well after that no matter how new they may be!
Revisit your fuel oil mix also depending how you ride and where you ride you may want anything from 30:1 mix to 50:1 mix to give reliability (35:1 - 40:1 mix is good place to start?)
I would change spark plug and clean pilot jet in carbi as first steps for this problem then once sarting again do some tests on different fuel mixes (small steps at a time though) to see what works best
good luck regards Jamie

Jun 03, 2011 | 2010 kawasaki KX 65

1 Answer

Poulan 16" saw, start fine,

Usually when a small engine starts fine.. runs fine.. gets hot it's ignition related.

First you want to make sure the cooling fins are clean.. remove any covers and clean the area around the head. If those fins are clogged.. not good.

Second I would check the spark.. and the spark plug condtion.

Also for power tools that don't get used that often.. fuel sytems get gummed up.. fuel gets old.. and folks tend to use the fuel in the can they mixed two seasons ago. Make sure the fuel mix is correct.

I assume it is running fine with the choke off.. however check the choke for proper operation.

Clean or replace the air filter as well.. once all the ignition and fuel components are in good order.. only then should you begin to adjust the carb. Probably not needed.. but don't do it until you are satisfied that you have good air fuel mix and proper spark.
Best of luck

Apr 08, 2011 | Poulan Pro 16-Inch 38 cc Anti-Vibration...

1 Answer

I've replace the spark plug, put in fresh gas and tested it for spark. My CS 100 chain saw will not start. Any help would be appreciated.

The spark at the plug (gapped 0.020") should be blue and snappy. If ok, pour a little fuel mix into the plug hole and try for start. If pops several times, then you have fuel delivery problems. Check the fuel filter, air cleaner, and muffler for plugging. Check the fuel lines for decay or other damage. Make sure the primer bulb fills with fuel when pumped several times. If nothing, either the primer is damaged or the carburetor needs cleaning inside. While in the carburetor, inspect the lower chamber diaphragm for hardness or cracking. Go to: for a 12 page article on Walbro brand carburetor theory and troubleshooting. Hope that some of this helps!

Oct 23, 2010 | Echo CS400 18" Chain Saw

1 Answer

Chain saw has gas but it will not start

Remove the spark plug and test for spark at the plug--it should be blue and snappy with new or clean plug set at 0.020" gap. If weak or nothing, remove the starter side cover to expose the flywheel and the ignition module. Check the module pole gap using a thin business card for a gauge--turn the flywheel magnets under the module poles, insert the card into the gap, loosen the module mounting screws and allow the module to stick to the magnets. Re-tighten the screws, then rotate the flywheel somewhat to remove the card. Recheck for spark--if now good, ok. If still bad, replace the ignition module using the same business card as before. If the first test produced good spark, place some fuel mix in the plug hole and try to start. It should pop several times. If ok, then check the fuel filter, air filter, and muffler for plugging. Check the fuel lines for decay or other damage. Make sure the carburetor fasteners are tight. Does the primer bulb fill with fuel after several pumps? If everything seems to be ok, Then you will likely need to clean and service the carburetor. Check especially, the lower diaphragm for hardness or cracking. There is a small screen filter in the main body that can be easily plugged with old fuel. Go to: for a 12 page article on Walbro brand carburetor theory and troubleshooting which applies to other carburetor brands as well. Hope some of this helps!

Jun 17, 2010 | Poulan 16" Chain Saw Bar Fits Many Models

1 Answer

The chain saw won't start when it is hot

Remove the spark plug to check for spark when it doesn't run. If spark is blue and snappy, pour a little fuel mix into the plug hole, replace the plug, and try to start. If you get a few pops, then concentrate on the fuel system. Check the fuel filter, air cleaner and muffler for any plugging. Check the condition of the fuel lines. Make sure the carburetor fasteners are tight including the ones holding the carburetor to the cylinder. Make sure that you are using fresh fuel with modern synthetic saw oil mixed at 50:1 ratio. Premix the two in it's own can and shake vigorously before filling the saw. If still having a problem, disassemble the carburetor, clean, and re-kit if necessary. Pay particular attention to the lower chamber diaphragm and the fuel metering valve that it controls. Go to: for a 12 page article on Walbro brand carburetors for great theory and troubleshooting information. Hope this helps!

Jun 06, 2010 | Husqvarna "Chain Saw - 16" Bar, 3 Hp

1 Answer

My 288 husqvarna wont start

Check for spark with a clean spark plug. If ok, squirt some starting fluid in the plug hole and try to start the engine. If you get a few pops, then work on the fuel system. Check the fuel lines from the tank to the carburetor for kinks, brittleness, or cracks. If it has a primer button, check the button for cracks or hardness and inspect it's lines. Do you have fresh fuel mix in the tank? Make sure the air filter is clean and in good shape. Check the muffler for plugging. If the saw is fairly old, the carburetor may need a re-kit and cleaning. Good luck!

Sep 09, 2009 | Husqvarna Chain Saw 20" Bar

1 Answer

Flymo quicksilver 46s keeps cutting out

make sure button not cracked also fuel filter sits in bottom of tank get you a peice of coat hanger and fish it out just pulls off the end clean it good and also double check your carb sometime you can lose a gasket and it will cause similar issues? let me know if any of this helps ? can also tell you how to adjust high speed side of carb if all else fails?

Aug 29, 2009 | Garden

1 Answer

Tuning curbs

so I think I could guess my way through it mechanicly but how do I know where to stop. My eikon 150 running rich currently (black dirty spark plugs) and I would like to lean it out properly but I'd much rather have a too rich bike fouling spark plugs than a too lean bike fouling engines. So how do I adjust it properly and how do I know when it's right? Hey Kit. Are the plugs oily, or are you getting white smoke out the pipes? Well, you may already know these symptoms might indicate another issue besides fuel mix. \Anyway, rich mixes don't make much power. You'll be surprised how quick your bike is when you get the mix leaned out a bit. First of all, I'd make sure the float levels are set correctly and that the float valves are indeed seating. If they don't close off the fuel flow tightly you'll get raw fuel dumping into the carb bores... not good. Also make sure the air filter is clean and there is absolutely no obstruction to air flow. If there are problems with either of these, nothing else you do will matter much. BTW,you'll know you're there when you get a tan or light brown color on your plugs.,,,

Nov 10, 2008 | 2005 Beta Eikon 150

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