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post #1 of 28 (permalink) Old Feb 15th, 2017, 10:24 pm Thread Starter
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Desmo Stick Coils

This thread is a final summary of Serious Black's original thread Stick Coil Conversion. Stick coil conversion - because I was curious. Inspiration goes to him. (Picture 5 is stock)

Stick coils, or "coil overs" on the old Desmos 748, 916, and 996 is what this thread is about. Effectively you remove the lunch box coil packs and wires and replace them with coils that fit in the spark plug galleys/passages.

The coils being used are 2008 Kawasaki ZX600/636. Part number F6T560. They fit very well. It is worth a few dollars to purchase the ZX harness for the correct pick-ups/connectors to the new coils. (Picture 1)

To make these coils work your spark plugs must allow you to remove the caps on the ends of the spark plugs. (Picture 2) New plugs are in order of if you cannot remove the end caps. I suggest iridium or platinum replacements b/c copper plugs don't hold up well to coil overs.

(Picture 3) Coils, all rubber is removable. -- Insert joke here -- In the picture, one of the coils has a rubber collar off and "feels" to seat better without it, but the collar will prevent debris from falling into the plug passage. Ultimately, it makes no difference and the inclusion or exclusion of the collar depends on how anal retentive a person is.

Wiring - The Ducati brown wires (x2) one per coil go to the red on the Kawaki harness. Those go to the Kawaki RedSee picture 2 if you are confused. The Ducati Green (x1) and Grey/Yellow (x1), different wire per coil, are the remaining wires that you need to solder to the Kawaki White/Green, Blue/White or whatever White/Color combination you took from the Kawasaki.

Picture 4 - Horizontal installed, no issue with v-cowl clearance
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97 916/996 "The Time Machine"

Last edited by Namor; Feb 16th, 2017 at 7:15 pm.
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post #2 of 28 (permalink) Old Feb 15th, 2017, 10:29 pm Thread Starter
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Picture 1 - Vertical installed, clears the wires and fuel pump housing

Picture 2 - Airbox on. Get over it, it is a test item. It has no bottom and is held together by fiber glass b/c it is one of those old flimsy sort that cracks on it's own. If I install a normal box rpms jump 2k. Indication of air restriction. Zero conclusion on this.

Picture 3 - Gutted breather with line to reed valve seen in picture 2. No conclusion on the significance of this other than I saved weight by deleting the crank case breather black thing and I did it b/c I was told OEM is best.


Now, to the results of doing the coil overs. "..... ... ... ." After simultaneously installing a new set of gears and chain I cannot say much. I can say that with a more than partially ruined Shoria battery (I keep it in to complete the circuit and typically jump start at the track) The Time Machine starts easier. Not much, but enough to notice and no need to jump. But just barely. No normal person could start it.

Running, I like to think that it is smoother. Is it me or the new gears/chain? Mostly the later. In my scientific approach to everything, I doubled the spark plug gap with my eye ball and some alcohol. I did compare the spark with the coil overs and bigger gap and the spark was/is substantially larger than OEM gap and coils.

I like the mod b/c it cleans things up and reduces weight. I speak of no performance gains at this point. And I will follow up on this thread if the coils ruin my ECU and/or as I put more miles on it.
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97 916/996 "The Time Machine"

Last edited by Namor; Feb 16th, 2017 at 4:21 pm.
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post #3 of 28 (permalink) Old Feb 16th, 2017, 3:20 am
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A big thankyou for the write up, been contemplating doing this for a while now.
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post #4 of 28 (permalink) Old Feb 16th, 2017, 3:29 am
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Very informative post. I'm watching with interest, good luck.

HM1100S, 998Bip
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post #5 of 28 (permalink) Old Feb 16th, 2017, 10:42 am
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Thanks for the info

weird question, but do they fit 1X98 head?
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post #6 of 28 (permalink) Old Feb 16th, 2017, 4:14 pm Thread Starter
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Quote:
Originally Posted by zambony View Post
... but do they fit 1X98 head?
I bet they will function fine, but the length of the coil may be the issue. I can take a measurement of the Kawasaki coil if someone has a XX98 coil measurement for me to compare.

97 916/996 "The Time Machine"
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post #7 of 28 (permalink) Old Feb 16th, 2017, 4:25 pm
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Funny that they used those "lunch boxes" in top level WSBK bikes
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post #8 of 28 (permalink) Old Feb 16th, 2017, 6:32 pm
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Quote:
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Funny that they used those "lunch boxes" in top level WSBK bikes
True enough. Top level race bikes used to use carbs too.

Neat idea. Not sure it's something I'm going to run out and do right away. I have enough things I actually need to do first!

I'm more interested in your air box situation... Are you actually running no filters with the bottom cut out? I assume this is a race bike, so maybe not subject to the typical crap a road bike might see, but...

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post #9 of 28 (permalink) Old Feb 16th, 2017, 6:37 pm Thread Starter
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Quote:
Originally Posted by miolta View Post
Funny that they used those "lunch boxes" in top level WSBK bikes
Odd, given that everything after 02 came with the coil overs. I would like to know the reason they did that on that race bike.

Quote:
Originally Posted by SS904 View Post
Are you actually running no filters with the bottom cut out? I assume this is a race bike, so maybe not subject to the typical crap a road bike might see, but...
Filters in the air runners. It was/is a track bike. But since I am in school and tracking is not a "reasonable" expense right now, I put a brake light back on (no horn, headlight, ect.) and commute some b/c a bike should not just sit.

And, the coil and airbox experiments are to facilitate an easier engine swap. Something like an 848 stroked to 916 or 984. That, b/c the engine is lighter and better.

97 916/996 "The Time Machine"

Last edited by Namor; Feb 16th, 2017 at 7:19 pm.
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post #10 of 28 (permalink) Old Feb 17th, 2017, 7:08 am
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I bet they will function fine, but the length of the coil may be the issue. I can take a measurement of the Kawasaki coil if someone has a XX98 coil measurement for me to compare.
I have a set of 1098 at home I'll measure them tonight. Thanks!

Where did you bought the Kawa coils, and how much did you get them for?
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