Stihl 039 rebuild coil help

[Mattkentdevon]

Hi guys, just replaced the bearing on a stihl 039. Tried to start it and it backfires, I’ve checked the flywheel is on the spine, but I did forget where this earth cable went so I left it out ? am guessing I’ve been a idiot. Can anyone tell me where it should connect?? Cheers 

[Stubby]

3 hours ago, Mattkentdevon said:

Hi guys, just replaced the bearing on a stihl 039. Tried to start it and it backfires, I’ve checked the flywheel is on the spine, but I did forget where this earth cable went so I left it out ? am guessing I’ve been a idiot. Can anyone tell me where it should connect?? Cheers 

Spud ! @spudulike

[spudulike]

From memory, I thought al the earth connections join on the top coil connection and this wire goes from the top coil screw and ends up joining the engine just behind the flywheel. I try to avoid these saws, bad experiences on them!!!!

Not sure why you have so many earth connections on yours, one should earth the coil laminations and the other provide an earth to the kill wire....you seem to have two earth connections and a spare one???

[Wonky]

Ohh the dreaded back fire....I think you need to be more specific, if its back firing then I would say the timing is out.

 

the wires are only to stop the spark, Ie earth it. So if you were to remove the spade connector and make sure it’s clean around the male part on the coil (no oil sawdust etc) keep the wire out of the way. If it starts and don’t backfire, you know it’s the wiring. , use the choke to stop It if it starts.
if it still backfires it’s coil and or timing

[Mattkentdevon]

On 24/06/2020 at 19:16, spudulike said:

From memory, I thought al the earth connections join on the top coil connection and this wire goes from the top coil screw and ends up joining the engine just behind the flywheel. I try to avoid these saws, bad experiences on them!!!!

Not sure why you have so many earth connections on yours, one should earth the coil laminations and the other provide an earth to the kill wire....you seem to have two earth connections and a spare one???

thanks spud  anything else to look out for ? From your bad experiences ? 

[spudulike]

Normal - check the fuel line, the carb for the normal stuff, the drum/sprocket, needle bearing, oil drive arm and oiler.

Just clean it up and check as you go.

[AHPP]

Can't help with fixing your 039 but I can sell you (or anyone) a working one. Enquiries and solicitations by private message.

 

[peatff]

On 24/06/2020 at 19:16, spudulike said:

I try to avoid these saws, bad experiences on them!!!!

 

My friend had one and every time he fixed one thing another went wrong. It never ran well.

[spudulike]

The one I was working on was like a boomerang. I think in the end it came back to a load of sawdust in the fuel tank, flushed it out and a new carb did it in the end......it depressed me tbh.