Topic: running cold on 2 and 3 (970cc build)

[awiertalla]

I built a 970cc bobber, which I have a previous post about it but I've encountered a new issue. I'm running cold on cylinder 2 and 3 (100-180), 1 and 4 is 270-290. It's not carb related, because I have mikuni 2 into 4, so 1 and 2 are on the same carb. I have the powerarc optical ignition (from cyclex), the coils, wires and plugs supplied by cyclex for the ignition, installed as per instructions. The cam is a kenny D cam, degreed pretty close to the numbers on the cam card. I've removed both 2 and 3 plugs, put them to the engine and got good spark on both. My thought is the timing is off, but I have no idea how to adjust the optical ignition. Any help is much appreciated. It turns on as well after some effort, so plug wires are definitely correct. Also, do I need to run a VOES switch with this build? I have never done one of those, so it's pretty foreign to me.

[calj737]

Cylinders 2/3 are served by the same coil, and the same side of the ignition plate. Swap 1/4 coil to 2/3. Does the problem follow?

The optical ignitions are timed by rotating the plate until the light comes on with 1/4 set at the proper mark. You can switch between timing curves loaded by using the (I think) Brown wire? But the curve is not your problem.

[awiertalla]

I used a piston stop and degree wheel to find tdc, and set that on the powerarc, and the tdc light is on at the correct time. I have checked it multiple times, including last night when I redegreed my cam. I thought about swapping the coils, but I was thinking if I swapped just the wires my timing would be off. But after reading that, I realized I can swap my input wires from the coil and that will work. It's always good to have different views. I'll try that today and see what happens.