ignitor wiring zr550

Interesting.
Thank you

How does it know which coil to fire?

The ignitor unit calulate the ignition sequence and advance. The special shaped rotor do the reference impuls (#1 cyl.) for the ignitor unit.

Correct, according to my Haynes manual all the ZR models use this single pulse / pickup coil method. On mine it is just like the pic from Scirocco.

Your wiring diagram looks correct as near as I can tell. I referenced the Haynes Manual zr550 wiring diagram as well as the mapping mentioned earlier in this thread of what zr550 wires map to what SPII wires.

Black to ground = good
Red to power = good

White and Green to pick up coil = good

Red/Yellow to 2/3 ign. coil ground = good
Yellow to 1/4 ign. coil ground = good

Great, thank you Zaddict! Unfortunately delivery is delayed a bit and then I am away for work for two weeks so wont get to try it out this weekend. But will post results as soon as I can. Cheers...

So, I installed the SPII system on the weekend and she is alive! Lucky during the process I checked the reg/rec and found it faulty and over charging the battery (I was using an old battery and jumper cables so no harm done). So I have disconnected the charge circuit awaiting a new reg/rec.
I then re-checked all fluids, bolt torques, tyre pressure and all over check. Then took her for a series of short rides and wow I am super happy! As Zaddict says, ridiculously easy to start and short time needing the choke.
I need to figure out the best timing setting as she is a bit rough at lower revs and under load up hills. Plus, I only had the standard spark plus so have ordered some Iridium plugs, once I have those in I will play with the settings. Any advice on setting the timing will be appreciated;
• Stock Motor
• Air-box totally gone and pod filters
• Exhaust is stock front collectors and then a stainless slip on muffler
• 1 size up on main jets

Thank you to Zaddict for your help!

Sean_Yalls wrote: So, I installed the SPII system on the weekend and she is alive! Lucky during the process I checked the reg/rec and found it faulty and over charging the battery (I was using an old battery and jumper cables so no harm done). So I have disconnected the charge circuit awaiting a new reg/rec.
I then re-checked all fluids, bolt torques, tyre pressure and all over check. Then took her for a series of short rides and wow I am super happy! As Zaddict says, ridiculously easy to start and short time needing the choke.
I need to figure out the best timing setting as she is a bit rough at lower revs and under load up hills. Plus, I only had the standard spark plus so have ordered some Iridium plugs, once I have those in I will play with the settings. Any advice on setting the timing will be appreciated;
• Stock Motor
• Air-box totally gone and pod filters
• Exhaust is stock front collectors and then a stainless slip on muffler
• 1 size up on main jets

Thank you to Zaddict for your help!

That’s great to hear . A dyno tune would be ideal. I haven’t managed to get a useful one yet - surprisingly hard to find a good tuner near SF. I’ve just been trying all the curves. My butt dyno tells me +4 to +6 advance works best.

You may need to adjust your jetting further. Going up just one size on the mains with pods doesn’t seem like enough. Factory Pro makes a Stage 3 jet kit for the zr550. Might want to check that out. Corey Clough has run that setup before - maybe he has jetting suggestions for you.

Are your carbs running stock internals, other than the one size up main jet? If you are running pod filters, you will need a jet kit. Dynojet works for me. This will get you there, but tuning on a dyno will be recommended for fine tuning. Tune for the correct air/fuel, not the top end number. You want "rideability".