Coil replacement

Raceman · Post by **Raceman** » Mon Oct 16, 2017 10:33 pm

My CA77 has a weak spark on both cylinders. Bike has new points and caps. Perhaps it's time for a new coil and wires. I see several options, Ebay aftermarket coils, Charlie's Place(expensive) and a Suzuki/Kawasaki coil. NOS Honda coils don't seem to exist. What type have folks had success with. Your input appreciated.

Nick · Post by **Nick** » Tue Oct 17, 2017 1:52 am

Still running the original coil in my 67 CA77, same coil it had when I found it in a junkyard 20 years ago - still runs fine.

Geoff Hastings · Post by **Geoff Hastings** » Tue Oct 17, 2017 11:17 am

Have tried a new capacitor? Cheaper than a coil.

Raceman · Post by **Raceman** » Tue Oct 24, 2017 10:30 am

I ordered a Magna dual output 5ohm coil from 4 into 1. Their site said it would work on a Dream. It may work but the side cover will not go on. Elsewhere on this site, people say most any coil from a 70's 4 cyl Honda will work. 4 into 1 has a 30501-300-003 reproduction coil for cb350f, 400f 550, and 750. The picture of it looks like it will fit ok. Anyone have experience with these coil from the 4 cyl Hondas?

DJM · Post by **DJM** » Tue Oct 24, 2017 4:12 pm

I've used both CB400 and CB750 carbs on a race motor in the past with no problems, either should work OK on your C77.

The CB400 coil has a higher low voltage resistance so current consumption will be a bit less than the CB750 unit.

Raceman · Post by **Raceman** » Sat Nov 04, 2017 6:34 pm

I installed the 30501-300-003 coil on my CA77. I was originally intended for use on CB550 and CB750. It fits properly and functions fine.