Question about Poulan Pro 42CC 2 Cycle Chainsaw, 18"

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Poulan will not fire off, no report when primed manualy.

Have set coil gap to 10 thousandths, new plug tested in another saw, get nice blue spark in plug. Put 2 dops of gas in cyl, doesnt even try Plug wire has been crimped & clamped down excessively, could this be the problem? Has anybody ever changed just the plug wire?

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Yes. I would start with the plug wire. If your gap is correct and you know that the coil is good. Then it should be the wire.

Posted on Jun 21, 2009

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Test the plug either by using a spark tester tool or by having the plug removed from the cylinder, then plug it into the coil wire, then place it somewhere against the metal on the engine, It has to be metal to ground the plug to complete the circuit. Dim the light and pull the cord! You should see a nice little blue spark...yellow or orange is weak and the coil may have issues or the air gap needs to be adjusted. Don't let the plug just hang in mid-air while connected to the coil and pull the cord. That may damage the coil.

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2 Answers

46 cc Sears/Poulan chainsaw will not start


Four things I can think of:
1) There is a short in your spark plug wire. When you bend it to connect the plug in the machine it allows the exposed cable to contact the engine block. Examine the wire all the way to the coil.

2) Flywheel key is sheared ( you obviously know how to take off the flywheel since you checked the seals).

3) Flywheel air gap is not set correctly. Loosen the coil. Put the cover of a notebook or the cardboard piece of a cigarette pack between the magnetic portion of the flywheel and the coil. Tighten the coil down. This will get you the proper gap.

4) Your cylinder/piston or rings are scrubbed out. Even though it passed a compression test, on rare occasions it will loose compression only when it fires. So do the following:

Remove your exhaust manifold. Look into the cylinder with a flash light. You are looking for scratches. Anything larger then a light fingernail is definite proof you need a new cylinder/piston assy.

If it passes that test do the following:

Pour mixed fuel straight into your cylinder until 1/4 full. Slowly pull your saw over while looking into the cylinder. If you see bubbles after the ring/rings go by then you need a new cylinder/piston assy. On rare occasions if no scratches are present on the cylinder wall or piston, you may be able to change just the rings.

First if you can get a inline spark tester so you can see if your getting spark with the plug installed.

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