SUCCESS!!! Just repaired Stihl 045/056 Bosch electronic ignition!!!!!

[mojo jojo]

Hello again.
Got 056AVE with no spark...going to do a Foggysail fix, but found out it doesnt have bosch ignition.
It is a Brasilian made 056AVE...magneto seems to be for breaker points 0 204 003 028, but the crankshaft doesnt have lobe for points. The ignition is Brasilian made some Megaville with transistor chip.
Can someone with foggysail bosch igniton 056 saw check the Magneto Bosch number written inside magneto?

 

[mojo jojo]

So. I deleted that potting with somekind of atom chip built-in and replaced it with PArtner RIFA Ignitron Chip that I had laying around. So far so good. It runs nice. Had to find a good spot for the chip to mount as it is not that small. Managed to tuck it under top cover and is accessible thru spark plug hole in the cover.

 

[Vek]

Notes on my fix…someone had spliced into the kill switch previously but with heavy 14ga wire, so to make room I reran the kill wire in 18ga. The kill switch wire plugs into the potting on the lobe opposite where you dig to find the capacitor leg. Could probably wire the kill switch to the hot leg of the capacitor if you want to keep most wiring out of the flywheel area.

The potting can be excavated with a sharp wood chisel, 1/4 or 3/8 wide. Clear epoxy at the surface of the potting changes to something else when you get close to the circuit board. I couldn’t lift the little ribbon on the pcb free, so I made sure the leg was severed and soldered wire to the exposed bar. No biggie.

Re-potted with OSI Quad caulk as I had a tube open for some other exterior construction tasks. Also bedded the capacitor with Quad, with capacitor tied down with zip ties. Will see how that holds up.

I don’t like the normal cap install location in the duct/volute between the flywheel fan and the cylinder, so in instead mounted it outside the duct but still inside the starter cover.

Now to see if the spark holds up when hot! Looking forward to that.