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Saw won't start, no spark, spark plug is dry

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Try a new spark plug first (gapped 0.020"), if still no spark, check the stop switch and wire first, then the ignition module located on the flywheel edge behind the starter. Make sure that you ground the plug base to the cylinder head when checking for spark. When you get spark, pour a little fuel mix into the cylinder and try for start--if it pops several times, then check the fuel system for a plugged filter as well as the air filter and muffler. If this is an older machine, you may have to clean the carburetor inside and out with spray carburetor cleaner. Check the diaphragm in the lower chamber for flexibility and no holes or cracks. Hope some of this helps!

Posted on Sep 09, 2010


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Fuel is OK. Wiring seems OK. Spark is OK. Piston is OK. Yet engine won't start. This is an old model and when we got it, it alwyas battled to start. It was serviced by an agent and worked for a very short...

When I have a problem starting a chainsaw, lawnmower etc what I do is;
  • Remove the spark plug
  • Pour about 5ml (one teaspoon) of fuel into the opening where the spark plug was.
  • Dip the spark end of the plug in fuel so the spark gap is wet
  • Replace the spark plug and try to start it again.
The fuel that you poured into the plug opening should ignite and may start the saw. If not try repeating it 2 to 3 times. Don't be tempted to use more than the 5 ml of fuel as you'll flood the saw. Assuming that there's nothing mechanically wrong with the saw this should get it running.

You probably know this but when you're leaving the saw up run it dry so there's no fuel left in the carburettor as this can cause gum to form in the jets which stops the fuel getting through. Most people run the engine dry when leaving it away at the end of the season but if you're having difficulty starting the saw I'd run it dry every time.

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Will not start and doesn't even fire. New saw used once. New mixed gas added and sill no fire. Acts like the on/off switch is not operating properly??

Take the saw outside and have a fire extinguisher handy.

With the switch in the OFF position, remove the spark plug and SLOWLY pull the rope.
If you notice raw, liquid fuel coming from the spark plug hole you have a fire hazard in you bare hands!

Gradually increase pulling speed to see if you notice any fuel vapors or mist coming from the spark plug hole. If you do, you have found the problem: It's flooded.
Continue pulling rope and use an air blow gun to LIGHTLY blow into the spark plug hole and dry the cylinder. You should pull 20 or 30 times while blowing air in.

If the cylinder is bone dry reattach the spark plug wire to the plug and touch the outer shell of the plug (or the threads of it) to a metal surface on the saw's engine (AWAY from the spark plug hole!) You can use any metal object to conduct the electricity and increase your reach if needed. Turn the switch back on and pull the rope medium speed and check for spark on the electrode of the plug. If no spark, turn switch to other position and repeat.

NOTE: IT WILL NOT SHOCK YOU as long as you maintain contact with the outer shell of the spark plug and the engine's metal parts.
If spark is present, reinstall plug and try again.

Be sure the choke lever is set properly for either cold or warm starts (whichever applies) and it should start easily for you in the future.
Hope this helps!

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