I hope somebody can help. I'm learning so please excuse any daft assumptions.
I have an old fs80av. I got it running beautifully until all of a sudden the recoil starter cracked and flew off. (screw holding it came loose) it carried on running for a short while then stalled.
I tried to get it started with a battery operated drill. Nothing.. I checked for a spark. Nothing. Changed the plug still nothing.
I then thought I would strip to see if all wires were intact. All appeared fine.
I tested voltage when turning her over and got readings although very low less than 1v and obviously fluctuating
I tested resistance between body and end of plug wire which returned 10ohms. and end of plug 16ohms
Firstly I presume that my cutoff switch seems as though it has had it. as if I test between between crank case and wire I get continuity no matter if my switch is on or off.
however on that point .. excuse really daft Question.. do i presume correctly by thinking Kill switch should complete circuit with ground/ earth to kill or break circuit and stop ignition?
Also how can i make sure my spacing is correct on this? I cant align stator and position as there is no shaft on which to centre the flywheel.
I know that you have a stihl engine, but this old Kohler manual, section 8 does an excellent job explaining how the ignition system works. If you do a search you can get a service manual for your unit. Hope this helps.
Thanks for the Kohler pdf. I see ref to 11.5k ohms. but this is a 4 stroke.. 11ohms is close to what i have. However the only ref to stihl i found was 5-7kohms.
What do you think of this and the other results obtained?
As per the Kohler manual, I have taken reading from switch wire to .. well it says mounting bracket which there is none. So i presumed the "forks". HERE is a link to a photo of module.. red line represents from where to where I have taken reading.
It does show continuity so i presume it is dead?
Can somebody please confirm I have taken the correct reading and my conclusion is correct?
I suspect you may have a bad coil, but before replacing set the gap between the coil legs and the magnets at .010 inches. Sorry I don't know the metric conversion. Testing resistance on magneto systems is not an exact science, but that being said, I feel that 11 ohms between spark plug lead and ground would indicate a shorted secondary lead or coil. Normally should be between 10K-17.5K depending on the size of the coil.
