2 wire coils?

[tony27]

Is there any Yamaha coils that are 2 wire rather than the normal single wire & mount for earth back through the frame?

[OverTheHill]

if we're talking cdi type i can't think of any but [someone else may know] suzuki common old mudbug & lots of other model suzuk's run a cdi coil with two wires. [now i'm confused but think that] second wire is to get a good earth right back to the coil from the stator plate & pretty sure the coil is earthed to the frame regardless via a small wire sneaking out to the coil post, think it's riveted to the 5mm mount hole. I have one & will check one out tomorrow. Can i ask--what's the plan? sounds interesting. Cheers.

[tony27]

Just an experiment on the CZ, have an RD400 coil running twin plugs hooked up to the Suzuki ignition & want to try a single plug without using the bulky Suzuki coil which is quite a lot wider than the RD coil
My guess is that it will need to be off a rubber mounted motor like the RD is

[OverTheHill]

maybe i'm thinking wrong but what's wrong with a single wire cdi coil & if you want just run a separate wire from the coil mount down to the motor. I just bought a used kawy kdx200 coil [coz it was $1] off trademe which has two wires. Get on trademe & put in number 625317135. Bad photo but google images should find a good one to view. Some chinese mini bike cdi coils have two wires or two terminals & nothing wrong with them. Just google imaged the coil myself & can't see a two wire kdx coil so now i don't know what i bought haha--plug lead is too short to be useful & [of course] everyone knows a short lead "advances the spark" & a long one "retards it"--like "steam rollers" are used to "roll Steam". Ok i'll go away. Cheers.
ps, Tony, twin plugs firing have to be better than 'one' any day of the week!!

[OverTheHill]

thought i'd better hit 'post' that last one before it times out. Got me thinking now though, many years ago i tried twin plugs on my RT2, might've been with RT2Mx top end--but--ran but didn't have enough voltage [or something] to charge the coil up etc. Had close plug gaps &, well, a disaster. But now thinking, onece apon a lifetime ago i bought a dt125 watercooled with a stuffed pulser/trigger  coil so fitted a coil/box combined off an RG50 & it ran perfect just using the source coil only, no trigger, must fire as the magnets get past a certain point on the source coil? [strobed it & spot on, just no real advancing so set it appropriately. SO-- with RT & it's twin plug head if i got a stator plate with coil mounts at 180 to each other & fitted a source cdi coil to each mount [one where lighting coil might be] then ran 'two' RG50 coils [same as LT50/JR50] coils--can see it now having trouble keeping the front wheel on the ground [maybe not]. Cheers.

[OverTheHill]

been thinking i'd better clarify my twin plug cdi idea. Am working on the theory from back when i strobed my AG100 grasshopper [assgroper] & found it fires at [the firing point] then again 180 from that by memory, was about 20 years ago so might be dreaming exact details--but--thought with two cdi charge coils 180 apart & the RG50 coil/box's being fired by the magnets passing a point on the coils, hoped she might fire two plugs at exactly the same time. Starting to think of reasons why it won't work so i'll have another beer & probably forget about it. Also Grasshopper had a seperate trigger coil plus think it had a notch in the centre bit [where a points cam would be] to activate the trigger. Toooooo hard.