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So I found some coil on plug coils that fit my CX500 head pretty nicely...I'm trying to find out why they won't work
I don't know exactly what they're off of...labeled as Mitsubishi 74 F6T558 6509.
All I could really think to is test resistance...the CX has resistor caps so I took those off and measured 2.5ohm from hot to ground and 8500ohm from hot to the the lead. On the Mitsubishi coils I measured 2.5ohm from hot to ground and 9400 from hot to the plug terminal. The CX plug caps usually have like a 1000ohm resistor in them.
Is there a way to tell if this is compatible or is a thing where I just have to plug it in and see?
If you replaced the CDI with ignitors and pickups or just points, I don't believe coil-on-plug would need resistors (plug, cap, or wire) since the resistor is for RFI suppression, and with coil-on-plug there is no appreciable transmitter antenna.
The Honda CX500 ran two different types of ignition system over the course of it's production run; CDI and TI. The GLs and 650s featured TI - for more information on all of the systems check out our articles here!
In that case you need CDI specific coils. I know diddly squat about electricity but I stayed at a Holiday Inn and someone over free breakfast said that the inductance is different because a CDI coil fires when it charges where a "normal" coil charges up and then discharges when it's triggered by points or an electronic trigger. With "normal" coil the magnetic field collapses when the points (mechanical or electronic) open and that cause the discharge.
So the guy at the waffle station said. If you want to upgrade the whole ignition system, Ignitech.cz sell a nice unit that would replace the old CDI black box and would allow you to use different coils. They have DC-CDIs and regular inductive type (TCIP)
You won't cook a coil with a CDI - the pulse is so brief that the heat load is tiny, much much lower than with an inductive ignition system. There's really no difference between a CD coil and an inductive coil. You can run virtually any coil with a CD but with an inductive ignition you have to take the primary resistance into account if the circuit doesn't have any current limiting/dwell control feature ie. a plain points-battery-coil setup. Also some of the OEM inductive coils have a driver built in. I've 'scope tested dozens of coils and some COP coils aren't too bad. But if you don't need the COP feature and you have the room there are much stronger performers, all of them rather bulky. The king of the inductive coils with built-in drivers is the Delco truck coil D585. For either CDI or inductive without driver (so-called dumb coils) the Ford V8 TFI coil or the GM HEI unit are hard to beat. As a general rule motorcycle coils are weaker than automotive ones, and the TFI and HEI coils are as good or better than "performance" coils.
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