Did you try a brand new plug. A hairline crack in the insulator will cause a plug not to fire, so will too much carbon on the plug, and a weak condenser.
SOURCE: Power Tools Chain Saws igniton problems
according to husqvarna the ignition coil is no longer avalible for this saw,the service bulliten says that every thing needs to be changed to make this saw work again.everything includes the flywheel,crank shaft,ignition coil,woodrif key,nut and washer.husquvarna will not let me order the origional coils.i do have a copy of the service bulliten if you would like a copy.just e mail me and i'll send one your way........
SOURCE: Echo CS8000 keeps burning up spark plugs
I'm not a small engine mechanic but it kinda sounds like its running to lean, not sure if there the same but if 4 cycle engines run way to lean they detonate and can melt a piston. Most of the time they will run fine under no load but once under load it will cause the detonation. If you have a compreesion gauge see if it has any compression if you dont have a gauge just put a finger over the spark plug hole and pull the starter to see if it builds any compression, if no compression probably a hole in the piston or bore hope this helps
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: Poulan saw will not start
This is not really a solution.... I can't post a comment. I think you know where I was going with the flywheel thing - whether or not the timing is right. I thought you'd pulled the flywheel yourself, and sorry, I'm not sure how to pull it. I'm assuming this is a 2 stroke motor... you might want to just check that the piston is near top dead center when the magnet on the flywheel hits the coil..... you can stick a pencil or anything long through the spark plug hole to give you an indication if the piston is at the top of the cylinder or not. Let me know how it goes!
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.
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