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Echo 330t chainsaw. This saw seems to be little used judging by the lack of scuffing on the bottom/ground side. It, like all the rest, ran great till it quit. What is there about small diaphram carbs that a kit properly installed won't fix? Do small passages get clogged with no way to clear them? I have rarely pulled a welch plug and found trash there. There is no wear on the butterfly shaft. I put the saw into the shop after my efforts failed, they failed too. Could there be something exotic like crankshaft seal problem? What is the test for seals? The rubber seal at the carb/cylinder seems ok, but can't tell if it's a boot that may have a leak. Carburators are the bane of my 63 years of life. Where can I get a proper education about Zamas, Walbros, etc.? What is the coffin nail that says I need a new carb?

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Posted on Jan 02, 2017

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SOURCE: 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.

Posted on Mar 31, 2009


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