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82 Kz750 ignition coils wired backwards 09 Feb 2016 11:00 #710150

  • dom2570
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I recently did a top end rebuild on my 750. Once I got it all back together, I had some issues getting it to start. When I did get it running it was rough,I had some backfire and really rough idle. I blamed it on leaky carb boots. I replaced the boots today while doing that, I noticed that I had stupidly installed the ignition coils backwards.

By backwards I mean the positive was on negative and negative on positive. I had/have the spark plug wires ran correctly( right to 1-4 left to 2-3). I have not had a chance to get a battery in the bike and try it out but I was curious if having that wiring screwed up could have caused the issues? Also what are the chances it could have ruined that coils? I ask because I don't have a multi-meter yet, one is on the list of tools to get once I get paid.
Whip it like a mule!

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82 Kz750 ignition coils wired backwards 09 Feb 2016 11:35 #710155

  • Nessism
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I'm not positive but don't think coils have polarity.

BTW, the coil wires and spark plug caps unscrew on that model. You might want to consider updating those parts.

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82 Kz750 ignition coils wired backwards 09 Feb 2016 11:39 #710156

  • 650ed
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Are you saying you ran the engine with no battery in the bike? :huh: Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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82 Kz750 ignition coils wired backwards 09 Feb 2016 12:18 #710163

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They are marked with polarity. That is how I figured out they were backwards. I have new ngk plugs and wires.

I haven't gotten a new battery yet because it is winter. I have one good battery in my 440 that I am currently using as my main bike. I just swap it around. When spring comes and it warms up I'll get a fresh battery.
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82 Kz750 ignition coils wired backwards 09 Feb 2016 12:37 #710168

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Ah, good. I was afraid you might be running it while hooked up to a charger or other power source that might fry things. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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Re:82 Kz750 ignition coils wired backwards 09 Feb 2016 12:49 #710172

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Turns out that was the problem. Got her to fire right up. Made it down the street a few times before we ran out of gas.
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