Topic: Odd coil problem

[68grandprix]

A few weeks ago I bought a Dyna S ignition for my 75 Cb750 and installed it. After installation and timing I could tell the bike wasn't running right. I used the timing light to check that for spark. Cylinders 1-4 are fine. Cylinders 2-3 are both running at idle, but when I rev the bike cylinder 3 cuts out for a second and then comes back, and cylinder 2 completely quits and doesn't start sparking again until idle. When I first got the bike running (a year ago) cylinder 2 wouldn't run, and then it just started working. A couple months ago I started the bike for a ride and cylinder 2 wouldn't work for about 5 minutes, then it kicked in and ran fine. The coil tests fine, and I've checked all connections. Any ideas? I was just going to buy some Dyna coils, but I want to be sure the problem is the coil. Thanks, Jimmy

[Dusthawk]

Sounds like coil to me, though it might also be the plug wires, a not so tight connection in the coil. Dyna coils are the bomb with the Dyna S so it'll work great. There are also some good threads regarding plugs, look for the Iridium. They are a bit pricy but complement the Dynas as well.
Peace,
Jeff

[68grandprix]

Would the copper core (non suppression) wires work fine with the Dyna S? Thanks, Jimmy.

[scunny]

just swap your coils over, if the problem shifts to new cylinder then it's the coil

[68grandprix]

I don't think the wires will reach, but I'll try. Thanks, Jimmy

[Rushoid]

You could try cutting the plug wire ends and reattaching the boots. That worked for me. Wait, no I replaced the boots. Anyway, worth a try.