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Posted on Jan 02, 2017
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
The piston on a 142 looks a little scored normally on the exhaust side. There could be several things. Make sure the fuel line has no holes and isn't pinched and the fuel filter isn't stopped up. Pour some gas in the carb to make sure it will run. If it don't the piston is shot or you some how got a bad plug. Take the plug out and stick it against the cylinder and see if you see any spark. Maybe if it don't start with gas poured in the carb bad ignition module.
Posted on Apr 26, 2009
Look for a pinched/bare stop-switch wire (I assume that you don't have spark now). Also, check the ignition coil core gap to the flywheel magnets (I use card stock to set the gap). Make sure the plug wire was not damaged again.
Posted on Sep 01, 2009
This saw needs aproxamitly 150 psi. Any less than 120 and you will have problems with the saw breaking up at high rpm and stalling under load. Pop the muffler off and take a peek at the piston and the cylinder walls for scoring. If its scored it will need a new jug and piston, the kit from Husqvarna, includes everything you will need, should run from $175.00 to $200.00. Hit us up on eBay MorganPower is our user name. http://www.morganpower.com/ is our website. Or you can email me at firstname.lastname@example.org
Hope this helps, feel free to email me with any other questions, we are a Husqvarna dealer/repair center and can help you out with that saw. It is a great saw all the features of the XP line at a fraction of the cost. It has the 3 piece crank and magnesium case. It is definitely worth putting the money into this saw!
Posted on Sep 12, 2009
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