Confusion - CDI/Gen 1/Gen 2 - Honda Rebel Forum
 
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post #1 of 9 Old 06-08-2018, 09:38 AM Thread Starter
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Confusion - CDI/Gen 1/Gen 2

Hi all!

Im confused.

Attached are the wiring diagrams for the Generation 1 Rebel 250 (classic) & Generation 2 Rebel 250.
My confusion is relating to the rewire to allow a Gen 2 CDI work with Gen 1 wiring as instructed in the stickie post.

Upon looking at the 2 diagrams and following the rewire instruction suggests to me modifying the wiring to work on a Gen 2 loom, not a Gen 1???? Im i missing something here?? only one blk/yel wire used? Aint that how a CDI for a Gen 2 is wired??

I tried this method/rewire to make a Gen 2 CDI work on a Gen 1 loom - it didn't work, nothing, no spark, nadda...
Reversing what I did, the bike fired up fine....

Maybe Im thick, it don't make sense to me...

R
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File Type: jpg Honda Rebel 250_G1.jpg (314.3 KB, 17 views)
File Type: jpg Honda Rebel 250_G2.jpg (298.1 KB, 21 views)
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post #2 of 9 Old 06-08-2018, 11:29 AM
 
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GEN2 CDI has a nanny circuit that gets connected to ground when the kickstand is up or the transmission is in neutral. GEN1 doesn't have a wire to support that, it has 2 coil wires instaed of 1. To use a gen2 CDI on a GEN 1 bike you need to ground the nanny pin and splice together the coil wires onto 1 pin. To use a GEN1 CDI on a GEN2 bike you have to remove the nanny wire from the harness and leave that pin unconnected.


I traced through the diagrams and put this together:



GEN1 = GEN2 CDI mapping

Gen 1 has 1 R/B(Red/Black) for power from the alternator, Gen2 has 1 BLK/RED for power from the alternator.
GEN 1 has 1 L/Y(Blue/Yellow) to receive the timing signal fron the pickup coil, Gen2 has 1 BLU/YEL to receive the timing signal from the Ignition Pulse Generator.
Gen 1 has 1 Dg(Dark Green) for continuous ground, Gen 2 has 1 GRN for continuous ground
Gen 1 has 1 B/W(Black/White) that runs to the Engine Run/stop and ignition key switch, Gen 2 has 1 BLK/WHT that runs to the engine run/stop and ignition key switch.

Gen 1 has 2 Y/B(Yellow/Black) to fire the coils, Gen2 has 1 BLK/YEL that splits to fire the coils.
Gen 1 has NO nanny connection, Gen 2 has 1 GRN/WHT that gets connected to ground when the sidestand is up or the transmission is in neutral.

some google searching and I put this together, hopefully someone can confirm or correct this:



Gen1 pins
================================================== =============

|| Blue/yellow(trigger) - Black/yellow(coil) || Black/white(kill switch) ||
|| Green(ground) - Black/yellow(coil) || Red/Black(power from alternator)||
================================================== =============

Gen2 pins
================================================== =============
|| BLU/YEL(trigger) - BLK/YEL(coils) || BLK/WHT(Kill switch) ||
|| GRN(ground) - GRN/WHY(nanny) || BLK/RED(power from alternator) ||
================================================== =============

2009 Honda Rebel 250; 2009 Honda Shadow 750 Spirit
"The bravest thing for me to do is admit when I am wrong" - unknown
HRF Answer #1 You should take the MSF Rider Course
HRF Answer #2 You need to clean your carburetor
HRF Answer #3 Sorry we assumed if you didn't say otherwise
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post #3 of 9 Old 06-08-2018, 11:37 AM Thread Starter
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Hi,

yeah, your findings seem correct to me. My CDI is GEN 2, although my harness/bike is GEN 1
The rewire of a GEN 2 to run on a GEN 1 rebel doesn't work for me, if I leave the GEN2 CDI and loom wiring as is, my bike runs, but if rewired, it doesn't.
I bought a GEN 2 CDI as my original broke. Maybe my bike is an anomaly?

Odd..!

Cheers
R
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post #4 of 9 Old 06-08-2018, 12:11 PM
 
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hmmm
The coils are just transformers, one end connects to the CDI, the other goes through the primary winding to ground, its possibly plugging a Gen2 straight in might achieve an 'acceptable' ground through the coil to ground, but then you would find the bike is firing on only 1 cylinder and the other would reek of unburnt gasoline.


or


are you sure it's an unmodified Gen1 harness? if the 2nd coil wire is already spliced to the first elsewhere you don't see, and the nanny wire looking like coilwire #2 is already grounded somewhere else you don't see and you move it to the first coil pin, that could ground out the coil pin and you get no spark at all....

2009 Honda Rebel 250; 2009 Honda Shadow 750 Spirit
"The bravest thing for me to do is admit when I am wrong" - unknown
HRF Answer #1 You should take the MSF Rider Course
HRF Answer #2 You need to clean your carburetor
HRF Answer #3 Sorry we assumed if you didn't say otherwise
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post #5 of 9 Old 06-08-2018, 12:18 PM Thread Starter
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interesting - not thought about that - think I may have to remove the harness. its def a gen1, although I did give it a strip down, clean and re-wrapping. Might have overlooked something upon re-assemble!

cheers
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post #6 of 9 Old 05-17-2019, 02:17 PM
 
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I know this is an old thread. I'm looking for the wiring diagram for a 2014 Rebel 250C. Is the 2014 model considered Gen 2 Rebel. If yes, then I've already picked up the wiring diagram herein.

I have a service manual, but I'm on the road, many miles separate me (on the bike) and manual I left at home.

Thanks,
David

---------------------------------------------------------
David-n-Marina (Athens, AL) -- Rolllll Tide!
* '14 Honda Rebel 250 (hers)
* '13 Kawasaki Concours 1400 (mine)
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post #7 of 9 Old 05-17-2019, 02:29 PM
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I believe the wiring is the same for all second generation Rebels, which yours is.

Keepin' all the left over parts. Gonna use 'em to build another bike!

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
Putting your bike year and model in your signature helps others help you!
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post #8 of 9 Old 05-17-2019, 02:39 PM
 
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Quote:
Originally Posted by flitecontrol View Post
I believe the wiring is the same for all second generation Rebels, which yours is.
Thank you!

---------------------------------------------------------
David-n-Marina (Athens, AL) -- Rolllll Tide!
* '14 Honda Rebel 250 (hers)
* '13 Kawasaki Concours 1400 (mine)
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post #9 of 9 Old 05-20-2019, 11:00 AM
 
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96-16 Gen2

2009 Honda Rebel 250; 2009 Honda Shadow 750 Spirit
"The bravest thing for me to do is admit when I am wrong" - unknown
HRF Answer #1 You should take the MSF Rider Course
HRF Answer #2 You need to clean your carburetor
HRF Answer #3 Sorry we assumed if you didn't say otherwise
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