Spray some starting fluid in the carb because it may not be getting fuel. If it fires the fuel may be bad. If the fuel is more than 2 months old dump it out and put in fresh fuel.
SOURCE: weak spark on 55 rancher chain saw/ airgap on magneto
the air gap is .010 to .012 inches,hope this helps, if not contact me and i'll help you with anything i can
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.
SOURCE: Craftsman Chainsaw will not start
It's your ignition, which you can take that stuff apart on the left hand side of the saw under the recoil. I have 2 of these, & you can get the parts. Maybe its just the magneto gap adjustment, which is like a business card or newspaper width gap. I would check that first. Hope this helps you, Rick
SOURCE: No spark from spark plug
New Saw? Warranty time
Electronic ignition? Replace entire module. Pinched wire to metal case part for ignition switch. Permanently shorted ignition switch--replace.
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