Stihl 084 help sought

[CO_Woodman]

Hi all,

I have a Stihl 084 which ran fine until I was sawing some bristlecone pine (heavy in resin). The bar and chain began to smoke and overheat, so I shut down the saw. After it had cooled I could not start it.

I checked for spark and was getting none. So I replaced the plug, and checked the short and ground wire (seemed fine). Still no spark.
I replaced the coil with a new coil, and found that I was getting spark sometimes. So I checked the spark leg and adjusted it a few times, also I checked the spark plug gap, and finally tested the resistance (ohm) on the ground wire (secondary coil winding) which tested to .960 (should be .7 - 1.0), and then the primary winding from the Spark plug wire/lead wire hood to the engine block which tested to 2.66 on my 2k ohm setting on the voltmeter.

According to the repair manual I need to be reading 7.7 - 10.3 and the repair manual says 'replace the coil'...well this coil is brand new, so I dont think that this is the most likely solution. The piston (as viewed through the exhaust port) seems fine (no scoring). It pulls fine, and I have tried working spark plugs in it. What would happen if the flywheel was not operating properly ???

I sure would appreciate some experienced advice on what to do next, and if anyone has one...I would like to borrow another working coil to test in the saw. As it is I am ready to sell this saw, if I cant fix it, and buy a powerful mid-grade saw to replace it.

Thanks

 

[flht01]

I'm no tech but would recommend posting the part number of the coil you installed, I know there are both 2 post and 3 post styles available. When the "real" help arrives, they'll probably want to know which one was installed.

I think I'd also pull the flywheel and check the key. Make sure the flywheel key location matches the type of coil you have installed.

Here's a thread that might help explain about the key location vrs. coil type

084 Keyway location for a three post coil

 

[CO_Woodman]

I have tried a three leg coil replacement and set the key position to the 'B' position...no luck, and that coil was phsically damaged (rubbed down on the laminate plates) . Then I bought a NOS coil 1124 400 1306 (two leg) and moved the key position back to the 'P' position, and got some spark...sometimes, but not enough it seems to get it running, or to get a consistant result from testing.

Thanks