Reply To: '65 BigTwin 40hp 1/2 spark

[rapier]

Thanks..The same plug that sparks on the lower is used on the top (and I’ve tested a few others…new and old)..

Hope the pics are OK – for some reason the facilty wasn’t there when I posted the other night…

I have completely removed the kill circuit wires, just had no idea what was going on under there with the flywheel on, so needed them out the equation for the time being.

The smooth HT wire shown in the pic is my replacement (changed over to be upper, has the ali ‘top’ tag attached.

Still getting 7-8 OHms on each new coil, new points set to 020 and clean, new J4Cs set to 030. Flywheel magnet appears strong. Mag plate can be eaten off. Both HT leads were scrubbed clean and checked. New capacitors fitted.

So, perhaps the Zhongfadz coil is suspect, but a. I’ve swapped them over and always got a spark on the bottom pot b. it’s reading is in line.

Or it’s positioning could be out, but the heels are pushed right back inline with the plate & the coil worked on the bottom. Points are Turkish made, but OEM I think.

Unless anyone has another option, I have new OMC coils I can try today and an indeterminate age 40hp Johnson’s mag plate I know was working last summer…