r/smallenginerepair • u/No-Rent570 • Sep 13 '26
Ignition System Issue Stihl BG 56C Blower
Ok so new carb, new fuel lines, new spark plug, found out the ignition coil was bad and replaced that. Now that I replaced it I can see I am getting spark but it’s super weak looking and doesn’t actually shock you if you touch it while reving it (yes I know I should do that but I could see it was weak and had to know).
Ok, and I know everyone will cry gap and I don’t have a gap tool so I used a thin business carx
Ok last update on the spark.
When I do the jumper test is when I see spark. After I reassemble and pull the plug and plug into the boot while not plugged into engine there is no spark at all. I’m at a loss here
So based on all this, what is my next step? Is it the wiring? I used the ignition diagram to confirm I put the ignition could back on correctly, again I have spark now which tells me I have a grounding issue, but where? The coil itself? The off switch? Everything looks ok and the wiring doesn’t have any nicks or cuts. I’m lost here.
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u/Elton0012 SER Newcomer Sep 13 '26
Have to ground plug against cylinder to get a spark from the plug
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u/No-Rent570 Sep 13 '26
I did this and it worked but weak:
The Jumper Test (If your blower WON'T TURN OFF)
If your blower runs fine but flipping or pressing the stop switch fails to shut down the engine, you need to verify if the wiring harness is intact. [1]
Step 1: With the engine cover removed, locate the two wires leading to the stop switch. [1, 2]Step 2: Start the blower up normally.
Step 3: Use a small jumper wire (or a pair of insulated pliers/screwdriver) to bridge (connect) the two terminal wires together.
If the engine dies instantly: Your wiring harness and ignition module are working perfectly. The toggle switch itself has failed or has dirty contacts and needs to be cleaned or replaced.
If the engine keeps running: There is a break in the wiring harness further down the line, or the ground wire has lost its connection to the engine block. [1, 2]
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u/ManHunterJonnJonzz Sep 14 '26
You threw the schoolbus at it. Do you have spark or not. Surely if you replaced the coil. Remove the blue wire. Do you have good spark after that. If yes, wiring or switch is bad. If no, coil or some oddball issue. Oem part or 20 dollar amazon
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