I am reposting some stuff from the MSN group here so we don't loose it forever.
From: MSN Nickname73_CL450 (Original Message) Sent: 10/29/2008 1:48 AM
Okay so a few of you have mentioned the XS650 replacement coils from Mike's XS. I've just received mine in the mail today and I really would like to install them correctly... I'd hate to melt them because I hooked them up backwards.
I think a few of you have already installed these coils so any advice / instruction would be fantastic. I've got new wires and non resister plug caps (thanks to the group for that advice). My 1973 CL450 k5 runs pretty good on 1.5 cylinders... I can't wait to ride her when the right cylinder has consistent spark.
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Recommend Message 2 of 9 in Discussion
From: MSN Nicknamestillstanding462 Sent: 10/29/2008 3:16 PM
Sure wish someone would answer this, as I am getting some in the mail tomorrow.
I'd especially like some details on the physical mounting - the electrical part is easy enough.
Recommend Message 3 of 9 in Discussion
From: MSN Nicknamestillstanding462 Sent: 11/3/2008 5:41 PM
Here's a link to how I just did it...
Recommend Message 4 of 9 in Discussion
From: MSN Nickname73_CL450 Sent: 11/3/2008 6:05 PM
Thanks! That's pretty much how I'm fabricating my mounting brackets except I'm using a wider piece of steel so the coils will be further apart. I would have had is finished this weekend but multiple Halloween parties got in the way.
Recommend Message 5 of 9 in Discussion
From: MSN Nicknamestillstanding462 Sent: 11/3/2008 6:29 PM
Be real careful about having the coils further apart - the tank won't fit on !!
I had to move mine in from the first position that I tried, because they hit the tank.
There's lots of vertical room, not much sideways.
Recommend Message 6 of 9 in Discussion
From: Flatulent Sent: 11/8/2008 11:21 AM
COP - Coil-On-Plug coils are very cheap and plentiful.
From outboard motors to BOP Americans to aircraft.
Ebay to junkyards.........
Recommend Message 7 of 9 in Discussion
From: MSN Nicknamerybowen Sent: 11/9/2008 12:56 AM
The problem with COP coils is that they are too low in resistance for stock points or common aftermarket ignitions.
Without a way to limit current there is no way to use them.
Recommend Message 8 of 9 in Discussion
From: Flatulent Sent: 11/10/2008 4:47 AM
Current-limiting resistors. Wheyou have 1.9 ohm coils and that is too strapped, drop in series 3.0-3.2 ohm resistor, about 5 watts, looks like a grey block of concrete. Dino suggested to keep aftermarket coils to 5 ohms.
Recommend Message 9 of 9 in Discussion
From: MSN Nickname73_CL450 Sent: 11/10/2008 3:55 PM
Mounted and wired the coils. Bike fired right up. Plenty of consistent spark on both cylinders. Went for a quick ride then noticed a big oil leak out of the left rear cover. Looks like it's time for allen head bolts and fresh gaskets.