New Coil Solution.

It says it's for point style ignition? Does your bike have points? I have the originals on my 82 400 SOHC, I would like to put a chrome one like this if it's possible.
 
I will post results when it comes in. I like the fact that it is oil filled and made of metal...my 81 did not come with points but I am converting it, though so far unsuccessfully due to the crap that Mikes sells. I bought 2 sets of coils and they both burnt out.
 
The poor man always pays twice, a lot of the time when you go the cheaper option its usually junk so you have to go ahead and buy the more expensive option anyway :shrug: I hope the new coils are good, they look good :thumbsup: Mikes xs is a bit disappointing that they even sell that crap.
 
I am sure that won't work for your bike. It looks like it's setup for a 360* crank like the xs650 has. Our bikes are 180* and require two coils with separate wires. Sorry to be the barer of bad news:(
 
Why would that matter. The coil fires when the ignition signals it to. If he hooks both wires from the old coils, to the posts on the new coil, it should receive the signal to fire every time it's needed, yes?
 
That coil has 1 primary and 2 secondary windings. It is designed for a dual plug cylinder. If one were to connect it using the points for #1, and both spark plugs, when cylinder 1 fires at TDC and #2 is at BDC of intake stroke, the fresh charge in #2 may light off. When #2 gets to TDC, there won't be a spark. Not going to work.
 
Yes BC, I got Japanese points and condenser.
As far as the new coil goes, I was guessing that it would have a dead fire on the exhaust stroke and a live fire on intake/compression. We will see...
 
that coil looks like it has two live inputs and so could only fire one set of leads at a time. Maybe wrong as I've not seen them before.
 
I used a universal 4 ohm set of emgo coils on my friend's cb360; they look similar with a metal case and all. They work fine.
 
that coil looks like it has two live inputs and so could only fire one set of leads at a time. Maybe wrong as I've not seen them before.

The 80-84 xs650 used this type of coil because of there 360* firing ignition.
 
Ah, Ok, I think I understand (or perhaps not). ;)

Given that the "signal" to fire the coil is the point grounding, when you attach the leads from both cylinders, one will always have power to it and will never fire??
 
Sounds to me like there will be four fires during each 720 degrees of rotation. There is a waste spark and fire spark for each cylinder per revolution or 360 degrees.The downside is, as Chris pointed out, that while one is firing the other is "loading" fuel and the waste spark could ignite the cylinder before it starts compression.
 
The "signal" to fire the coil is when the points OPEN.

The ignition coil is nothing more than a transformer when you get right down to it. When the points are closed, the primary winding is energized and creates a magnetic field. When the points open, the current through the primary winding stops, the magnetic field in the coil collapses and induces a charge in the secondary winding. Because the secondary winding has more wraps of wire than the primary winding, the voltage in the secondary is higher. This is effectively the spark.

Our engines require 2 separate ignition systems because of the 180 degree crank. The coil mentioned above appears to have + (battery) and - (points) stud connections for the primary winding, and 2 connections for the plug wires that will both fire simultaneously.

As Chris has stated, this would work for a 360 degree twin like the XS650, or a single with 2 spark plugs. I can't see how it would work for both cylinders of our bikes. I expect that only 1 cylinder will fire correctly and the other, well... It could get ugly with rough running, backfiring and flames.
 
That is the problem, I have spent over $100 at Mikes OEM replacements that are total junk, I burned out two sets just trying to hook them up. They were not left "ON" long enough to get hot. I am just looking to see if this 5 ohm dual output coil will accept two leads for spark signal from points. I think it will work.
 
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