CBR 600F 1987 - 1990 CBR 600F Forum

Stick coil mod for the F1

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Old Jan 10, 2015 | 01:04 AM
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CorruptFile's Avatar
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Default Stick coil mod for the F1

I'll start by saying this was almost entirely copied from SB's how to for the 1000f. https://cbrforum.com/forum/how-tos-8...ensive-139800/
There was a few minor differences and I will post some pictures of my steps. Pretty easy to figure out.
First, what you need:
- Soldering iron/solder/flux/heat shrink (prefered)/electrical tape/snips/strippers
- Wiring harness (I used a harness from an 04-05 1000rr). You are safe using any of the denso harnesses though, it appears they are all the same
- 4 stick coils. MAKE SURE YOU GET THE SHORT ONES. I'll post a comparison below. The ones I got were from an 02 GSXR600, but again, all of the Denso shortys should work
- Multimeter
- 4 male spade connectors
- 10' or so of 18-22 ga wire. I used 18 ga because I had alot of it. If you can get different colors it makes it much easier. I used one color and was careful
- M+F 4 wire trailer harness (or other 4 wire plug, but I got the M and F kit for $2)

Here are the 2 types of coils. You want the ones on the right
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Here is the overall schematic. I used Blue for the white wire on the wiring harness.
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You want each stick coil to have roughtly 1.0-1.5 ohm of resistance. When you connect them in series, the resistance is additive and adds up to 2.0 - 3.0 ohms. The coil packs have a resistance of 2.5 - 3.1 ohms, so this method won't burn out your CDI!
Coil:
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Coil pack:
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After you remove the coils and the HT leads, you can get started on the new wiring.

Clip the plugs off the new harness. Leave enough room (~2") to allow you to solder easily.

I used SB's trick of cardboard to space the coils. Starting from 4 on your left, mark coil #3 at about 3" to the right, and #2 about 8" from #4, and #1 about 11" from #4. Leave a bit of slack in your wiring.

Stick the coils through with the connectors facing away from you and connect the connectors. Strip the wires and tin them.

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Work your way from right to left, leaving enough room past #4 for the connector to easily connect near the back of the carbs somewhere. I heart shrunk everything to keep it tidy, but you need to think logically and make sure you don't leave a wire out. Start with the 2 'bridges' between 1-4 and 2-3, then run your other wires out.
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Wire in your plug. You don't have to do exactly as I did, but feel free to.
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Prepare the bike side plug. I seperated the wires into the 2 bundles and crimped the spade connectors on.
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I cut the rubber caps from the old HT leads, but I don't really like it, so I might try another method of keeping crap out of the plug wells.

Good idea to test to make sure you didn't mess up. If you followed my wiring diagram, you should get around 3 ohms connected the middle 2 connectors on the plug, and the outer 2 as well. You should have infinite resistance between 1-3 and 2-4.
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Hook up everything and that's it. It's a really easy mod. I haven't had a chance to ride with it yet, but I did a cold start (sitting ~2.5 months) and with fresh gas it fired right up.
 
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Old Jan 10, 2015 | 04:33 AM
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Great write up CorruptFile - needs to go in the How To section.

Cheers, SB
 
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Old Jan 10, 2015 | 07:27 AM
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Good job!


This needs to be a sticky.


What are you going to do when you need to use your trailer now?


Those trailer light plugs corrode easily...did you put some dielectric grease on the pins?
 
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Old Jan 10, 2015 | 12:36 PM
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Originally Posted by dennisgb
Those trailer light plugs corrode easily...did you put some dielectric grease on the pins?
Great point. I am rewiring my r/r and put some permatex on my shopping list. That will definitely help.

I am aware those trailer connectors aren't the best thing out there, but they are easy to find, cheap, and they don't come apart very easy.

Thanks
 
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Old Jan 10, 2015 | 06:03 PM
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That was a tongue in cheek comment. Put some dielectric grease on it and it will last forever. Not Permatex.
 
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Old Jan 10, 2015 | 06:06 PM
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Old Jan 10, 2015 | 06:56 PM
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Yup. Most of us old guys think Pematex = Gasket Sealer. That's what most mechanics will think when you say that. Brand names don't mean much anymore...I guess.
 
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Old Jan 10, 2015 | 07:31 PM
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Originally Posted by dennisgb
Yup. Most of us old guys think Pematex = Gasket Sealer. That's what most mechanics will think when you say that. Brand names don't mean much anymore...I guess.
Fair enough. I wasn't thinking about gasket maker. That would certainly keep the connector together.
 
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Old Mar 27, 2015 | 09:05 PM
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Just want to +1 this. Had an intermittent miss on one cylinder that seemed to be there throughout the rev range. Built up the mod using GXSR600 coils and a modified F4 wiring harness. I rewired the harness to put plugs 1-4 and 2-3 in series, lopped off the harness connector, added about a foot of wire to the harness and terminated the wires with 1/4" male quick connects that fit right into the original coil connectors. All connections soldered and covered with heat shrink. Just finished it and my initial impression is that it solved the problem nicely.
 
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Old Mar 27, 2015 | 11:25 PM
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Awesome! Glad it worked for you too.
 
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