Changing the Spark Coils - Wrist Twisters
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post #1 of 21 Old 11-06-2015, 11:00 AM Thread Starter
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Changing the Spark Coils

I am going to replace the spark plugs on my 919 this winter among other things (24K miles). While I'm under the tank I would really like to change out the bright red coils and put something less gaudy under there. Does anyone know what coil I can use that will either have replaceable wires or will have black wires and boots?

Will the CBR900RR coils be a drop-in? I know the 929RR went to stick coils and I can't use those.

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post #2 of 21 Old 11-06-2015, 11:49 AM
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Changing the coils? Wires or both?

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post #3 of 21 Old 11-06-2015, 12:14 PM Thread Starter
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I think the wires are fixed to the coils on the 919. If they are, then changing the coils and the wires would be one and the same. Nothing is wrong with my coils, I just don't like the red wires and boots on my silver/blue bike. If I am mistaken, and I can just go to the local auto parts store and get some bulk wire and boots, let me know.

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post #4 of 21 Old 11-06-2015, 02:26 PM
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They are not attached. Unscrew the cap and pull the wire out.

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post #5 of 21 Old 11-06-2015, 05:57 PM Thread Starter
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So I can just go buy some wire and boots from the auto parts store and replace what is there? That would be awesome.

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post #6 of 21 Old 11-06-2015, 06:40 PM
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Quote:
Originally Posted by jmdavis984 View Post
So I can just go buy some wire and boots from the auto parts store and replace what is there? That would be awesome.
Wire yes, boots no. The 919's boots are very long *and* are designed to seal the spark plug cavities against water - as such they're not a common size found in auto parts stores.

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post #7 of 21 Old 11-06-2015, 06:59 PM Thread Starter
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Originally Posted by CB700S View Post
Wire yes, boots no. The 919's boots are very long *and* are designed to seal the spark plug cavities against water - as such they're not a common size found in auto parts stores.
So that still leaves me with ugly red visible under my tank. I know at least one person on here did a swap to all black. @Wolf, according to this thread: https://www.wristtwisters.com/forums/...s-33394-5.html

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post #8 of 21 Old 11-07-2015, 03:54 AM
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Yes, those are early CBR900RR parts he used, as I recall. They are a direct swap; the later CBR900RR used coil on plug which the 919's electrical system is not directly compatible with as the ECU has no idea how to run it.

You will need 1999 or newer CBR900RR parts. Fortunately, the 900RR's caps/boots and wires are available separately. Using the 1999 CBR900RR for a base nets this part number: Cap, 30700-KY2-701, four required, $28.25 MSRP.

CBR900RR wires will electrically and physically work with the 919's coils (as well they should - the 919 and 900RR have the same coils) but the 919 has one coil mounted parallel to the frame and one mounted perpendicular where the 900RR has both coils perpendicular so the length is different.

One issue is that the 900RR parts actually cost significantly more than the 919 parts. Prices below are slightly discounted from MSRP and are courtesy of one of my local dealers.

900RR:




919:





Personally, I'd get new 919 parts and use a $7 can of this to change them from red to black.



That said... why are you replacing your caps and wires with just 24K on the clock? Honda wires usually last decades and 100K if not more.

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post #9 of 21 Old 11-07-2015, 05:54 AM Thread Starter
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Originally Posted by CB700S View Post
Yes, those are early CBR900RR parts he used, as I recall. They are a direct swap; the later CBR900RR used coil on plug which the 919's electrical system is not directly compatible with as the ECU has no idea how to run it.

You will need 1999 or newer CBR900RR parts.
I assume you mean I will need 99 or OLDER parts?

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Originally Posted by CB700S View Post
That said... why are you replacing your caps and wires with just 24K on the clock? Honda wires usually last decades and 100K if not more.
Thanks for the info and suggestions. Really, the only reason I want to replace the wires and caps is because they are red. They work just fine. They are just the only red item on the bike, and they stand out in a bad way.

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post #10 of 21 Old 11-07-2015, 06:07 AM
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Sorry, yeah, 1999 or older. My mis-type.

Honestly, just clean up your existing wires and caps and Plasti-dip them then. It will be a lot cheaper and work just as well. I'd say one spray can would do it.

Not to mention they'll look better longer. The 900RR parts turn gray after a few years exposed to the elements.

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post #11 of 21 Old 11-07-2015, 06:19 AM Thread Starter
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Originally Posted by CB700S View Post
Sorry, yeah, 1999 or older. My mis-type.

Honestly, just clean up your existing wires and caps and Plasti-dip them then. It will be a lot cheaper and work just as well. I'd say one spray can would do it.

Not to mention they'll look better longer. The 900RR parts turn gray after a few years exposed to the elements.
I honestly never considered plasti-dip. I'll give that a try and see how it holds up.

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post #12 of 21 Old 11-07-2015, 08:32 AM
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Clean your wires and caps *real* well - Plasti-Dip is flexible and will last but only if the surface it's clinging to is clean and well prepared.

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post #13 of 21 Old 11-07-2015, 06:25 PM
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I believe @HeliMech was the first one to do this mod. Once @Cloroxbleach4 did it I had to follow suit. I wouldn't recommend the plasti dip... Seems it would all melt with the heat. Here is the nicest set I could find on eBay for the least money. 98 Honda CBR 900 RR CBR900 CBR900RR 99 Spark Plug Wire Boot Boots Wires | eBay
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post #14 of 21 Old 11-09-2015, 06:04 AM Thread Starter
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Originally Posted by Wolf View Post
I believe @HeliMech was the first one to do this mod. Once @Cloroxbleach4 did it I had to follow suit. I wouldn't recommend the plasti dip... Seems it would all melt with the heat. Here is the nicest set I could find on eBay for the least money. 98 Honda CBR 900 RR CBR900 CBR900RR 99 Spark Plug Wire Boot Boots Wires | eBay
HA! I actually put that listing in my watch list a few days ago, after starting this thread. Good to see the recommendation.

I was also concerned about the durability of the plasti-dip in a vibration and heat intense environment. I think I will go with 900RR parts.

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post #15 of 21 Old 02-16-2017, 07:41 PM Thread Starter
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So I finally got around to replacing my coils and wires with those from a CBR900RR. I bought some from a 93 CBR off eBay. I can confirm that they are 100% compatible. I didn't even have to shorten the wires, other than cylinder #1 being about 2" longer they were all the same length as the 919 wires. The black wires look soo much better than those stand-out red wires.

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post #16 of 21 Old 04-17-2019, 03:51 PM
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Just for shits and giggles I'm going to do this as well.
Change out the red plug leads and boots/caps for black cbr900 ones. Brought some off eBay.
I will post before and after pics.

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post #17 of 21 Old 04-30-2019, 09:17 PM
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Got me some black bits.
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post #18 of 21 Old 04-30-2019, 10:16 PM
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Your bike will be so blacked out, it could play for NZ.

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post #19 of 21 Old 04-30-2019, 10:44 PM
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It already does its own version of the haka, the Honda Haka.
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post #20 of 21 Old 05-11-2019, 06:38 PM
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Last night I fitted up the plug wiring and I frickin love it. No more red.
Two wires were slightly longer than stock, better than too short. Trimmed em.
I was glad to see most of the bends matched well. I didn't want to go bending wires already 'set'.
Bike still runs.
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post #21 of 21 Old 05-12-2019, 12:52 AM
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...
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