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CB250N ignition issues

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reece1804
L Plate Warrior



Joined: 12 Oct 2010
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PostPosted: 07:22 - 12 Oct 2010    Post subject: CB250N ignition issues Reply with quote
Hi can anyone help me diagnose an ignition problem with my 1980 CB250N?
It has no spark at the spark plugs, there is power coming from the blue and white wires from the stator up to the CDI unit. There is no power coming from the two wires out of the CDI into the coil. I have put a known good CDI unit on and nothing changed.
Thanks
Reece
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SillyMe
Trackday Trickster



Joined: 11 Oct 2010
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PostPosted: 17:17 - 12 Oct 2010    Post subject: Reply with quote
Then the only other thing is the timing (Not likely) or the regulator rectifier and any breaks in the wire.
https://img842.imageshack.us/img842/9216/p31600413008thumb.jpg
____________________
Once made equal to man, woman becomes his superior.
The man who says "I may be wrong, but -" does not believe there can be any such possibility
Owned and rode: Honda 100H, Honda MBX 125, Kawasaki AR 125, Suzuki RG 125 Pepsi, Honda NSR125 RK, Honda NRS 125 race bike, Suzuki GSXR 400 Bandit, Aprilia RS 125 O2, Honda CG125, Kawasaki KMX 125, Aprilia RS 125 O6, Suzuki XT225 and now Honda XR 400. ( A few scooters and other dead beats in between)
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 18:19 - 12 Oct 2010    Post subject: Reply with quote
Reg/rec shouldn't bother it. As long as there is power in the battery, it ought to run.

I'd check the pickup coil on the rotor and the wiring to and from it.

Also, not sure how it's setup on that bike but possibly a malfunction with one of the idiot switches. Neutral light coming on? Killswitch in the on position?
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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SillyMe
Trackday Trickster



Joined: 11 Oct 2010
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PostPosted: 18:54 - 12 Oct 2010    Post subject: Reply with quote
stinkwheel wrote:
Reg/rec shouldn't bother it. As long as there is power in the battery, it ought to run.

I'd check the pickup coil on the rotor and the wiring to and from it.

Also, not sure how it's setup on that bike but possibly a malfunction with one of the idiot switches. Neutral light coming on? Killswitch in the on position?


Yeah timing and points on these, missed that one.
I have an XR400 with no battery but a regulator rectifier is fitted.
Just wondering how this bike is wired up!
If it's all wired up through the battery it and the regulator rectifier is bust it won't fire.
Also when you turn the ignition on do the lights and and other stuff work. Could even be the ignition barrel/dodgy conection.
____________________
Once made equal to man, woman becomes his superior.
The man who says "I may be wrong, but -" does not believe there can be any such possibility
Owned and rode: Honda 100H, Honda MBX 125, Kawasaki AR 125, Suzuki RG 125 Pepsi, Honda NSR125 RK, Honda NRS 125 race bike, Suzuki GSXR 400 Bandit, Aprilia RS 125 O2, Honda CG125, Kawasaki KMX 125, Aprilia RS 125 O6, Suzuki XT225 and now Honda XR 400. ( A few scooters and other dead beats in between)
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 23:15 - 12 Oct 2010    Post subject: Reply with quote
Esoteric1 wrote:

If it's all wired up through the battery it and the regulator rectifier is bust it won't fire.


It will. As long as the battery has some charge in it (needs a surprisingly small amount of charge actually).

As it happens. I don't think the CB250N is wired through the battery. Pretty sure they self-excite meaning you could remove both the battery AND the Reg/rec and it would still run.

Just as an experiment. Unplug the white on black wire from the CDI (seperate to the two connector blocks if I have the correct wiring diagram) and try it then. If this wire is earthed, the bike will not run.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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reece1804
L Plate Warrior



Joined: 12 Oct 2010
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PostPosted: 02:07 - 13 Oct 2010    Post subject: Reply with quote
thanks guys.
I have tried disconnecting the white/black wire from the CDI, still doesn't fire. Is this wire for the kill switch?

The bike is not wired through the battery, so don't need it to start, only to activate the starter motor.

Stinkwheel, do you have a wiring diagram electronically or is it in a manual? I have tried to download one so I can check which wire comes from the pick up. Can't find one online.

I am trying to get the bike ready to sell after 2 years of faithful service. Isn't it funny how they don't give you any grief until you want to sell them.
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SillyMe
Trackday Trickster



Joined: 11 Oct 2010
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PostPosted: 08:08 - 13 Oct 2010    Post subject: Reply with quote
Well I found these via the net and the wiring diagrams are on the last pages.
https://www.hondampe.com.au/docs/owning_a_honda/owners_manuals/motorcycles/CB250-1992.pdf
File>save as to your desk top.

Source: https://online-pdf-search.co.cc/index.php

There ain't much about the super dreams that differ so this should be good.
____________________
Once made equal to man, woman becomes his superior.
The man who says "I may be wrong, but -" does not believe there can be any such possibility
Owned and rode: Honda 100H, Honda MBX 125, Kawasaki AR 125, Suzuki RG 125 Pepsi, Honda NSR125 RK, Honda NRS 125 race bike, Suzuki GSXR 400 Bandit, Aprilia RS 125 O2, Honda CG125, Kawasaki KMX 125, Aprilia RS 125 O6, Suzuki XT225 and now Honda XR 400. ( A few scooters and other dead beats in between)
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 11:52 - 13 Oct 2010    Post subject: Reply with quote
reece1804 wrote:

Stinkwheel, do you have a wiring diagram electronically or is it in a manual? I have tried to download one so I can check which wire comes from the pick up. Can't find one online.


There was one for a CB400N in the wiring diagrams thread in the workshop section of this forum. As far as I know, this is exactly the same as the CB250N.

It was pretty thin on detail as to what each wire does though, just had them all connecting to a circle where the alternator is with no indication of their relationship to the various parts.

Yes, the white on black goes to the ignition and kill switch. Earthing it kills the spark.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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SillyMe
Trackday Trickster



Joined: 11 Oct 2010
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PostPosted: 13:26 - 13 Oct 2010    Post subject: Reply with quote
stinkwheel wrote:
reece1804 wrote:

Stinkwheel, do you have a wiring diagram electronically or is it in a manual? I have tried to download one so I can check which wire comes from the pick up. Can't find one online.


There was one for a CB400N in the wiring diagrams thread in the workshop section of this forum. As far as I know, this is exactly the same as the CB250N.

It was pretty thin on detail as to what each wire does though, just had them all connecting to a circle where the alternator is with no indication of their relationship to the various parts.

Yes, the white on black goes to the ignition and kill switch. Earthing it kills the spark.




Honda CB125 74 Service Manual ENG https://www.megaupload.com/?d=1HR7J1TE

Honda_CB125_CB160_Shop_Manual_1972 https://www.mediafire.com/?5ignzmzdh2v

Honda CB250,360,CL360,CJ250 T,360T Service Manual ENG https://www.megaupload.com/?d=NU65ZOAL or
https://www.mediafire.com/?dufwgzn1wjw or
https://www.megaupload.com/pl/?d=29MXHLW4

Honda CB,CL,SL 250-350 https://www.mediafire.com/?5f3menxnmzm

Honda CB250rs https://www.4shared.com/file/247817086/d6a004bb/cb250rs.html


Honda CB400 N Parts List https://www.megaupload.com/?d=Q1VZTP16

Honda CB400 N Service Manual GER https://www.megaupload.com/?d=OSXAU4B8 or https://www.mediafire.com/?f2yyzzlbzdy

Honda CB500 (S) 93-01 Haynes Service Manual ENG https://www.megaupload.com/?d=QWI03K35


Source: https://www.bikechatforums.com/viewtopic.php?t=140295
____________________
Once made equal to man, woman becomes his superior.
The man who says "I may be wrong, but -" does not believe there can be any such possibility
Owned and rode: Honda 100H, Honda MBX 125, Kawasaki AR 125, Suzuki RG 125 Pepsi, Honda NSR125 RK, Honda NRS 125 race bike, Suzuki GSXR 400 Bandit, Aprilia RS 125 O2, Honda CG125, Kawasaki KMX 125, Aprilia RS 125 O6, Suzuki XT225 and now Honda XR 400. ( A few scooters and other dead beats in between)

Last edited by SillyMe on 16:07 - 13 Oct 2010; edited 1 time in total
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truslack
World Chat Champion



Joined: 08 Apr 2007
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PostPosted: 14:55 - 13 Oct 2010    Post subject: Reply with quote
Esoteric1 wrote:


Source: https://www.bikechatforums.com/viewtopic.php?t=140295

What was the point in posting a load of links to wiring diagrams that are nothing like the superdream? Rolling Eyes
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SillyMe
Trackday Trickster



Joined: 11 Oct 2010
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PostPosted: 15:58 - 13 Oct 2010    Post subject: Reply with quote
stinkwheel wrote:
reece1804 wrote:

Stinkwheel, do you have a wiring diagram electronically or is it in a manual? I have tried to download one so I can check which wire comes from the pick up. Can't find one online.


There was one for a CB400N in the wiring diagrams thread in the workshop section of this forum. As far as I know, this is exactly the same as the CB250N.

It was pretty thin on detail as to what each wire does though, just had them all connecting to a circle where the alternator is with no indication of their relationship to the various parts.

Yes, the white on black goes to the ignition and kill switch. Earthing it kills the spark.


So thought I would find them and post all associated links in the hope that a more positive person may narrow down the possibilities unlike your self it would seem.

There is a PDF there I found which i belive to the correct manual for the job in question. https://www.hondampe.com.au/docs/owning_a_honda/owners_manuals/motorcycles/CB250-1992.pdf

What's the point in light son?
Sun light!

I love clowns!
____________________
Once made equal to man, woman becomes his superior.
The man who says "I may be wrong, but -" does not believe there can be any such possibility
Owned and rode: Honda 100H, Honda MBX 125, Kawasaki AR 125, Suzuki RG 125 Pepsi, Honda NSR125 RK, Honda NRS 125 race bike, Suzuki GSXR 400 Bandit, Aprilia RS 125 O2, Honda CG125, Kawasaki KMX 125, Aprilia RS 125 O6, Suzuki XT225 and now Honda XR 400. ( A few scooters and other dead beats in between)
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truslack
World Chat Champion



Joined: 08 Apr 2007
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PostPosted: 16:05 - 13 Oct 2010    Post subject: Reply with quote
Esoteric1 wrote:


So thought I would find them and post all associated links in the hope that a more positive person may narrow down the possibilities unlike your self it would seem.


Okay, I'll narrow down the possibilities. The wiring diagram for a 02 reg hornet 900 will not be the same as a superdream Laughing

Reece, if you want a haynes manual, I'll send you one for the cost of postage.
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Current: Suzuki RG 125 Gamma, Honda H100, Triumph Tiger 800XC, Suzuki SV650 (minitwin)

Last edited by truslack on 16:08 - 13 Oct 2010; edited 1 time in total
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SillyMe
Trackday Trickster



Joined: 11 Oct 2010
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PostPosted: 16:07 - 13 Oct 2010    Post subject: Reply with quote
K. No worries I will edit.
____________________
Once made equal to man, woman becomes his superior.
The man who says "I may be wrong, but -" does not believe there can be any such possibility
Owned and rode: Honda 100H, Honda MBX 125, Kawasaki AR 125, Suzuki RG 125 Pepsi, Honda NSR125 RK, Honda NRS 125 race bike, Suzuki GSXR 400 Bandit, Aprilia RS 125 O2, Honda CG125, Kawasaki KMX 125, Aprilia RS 125 O6, Suzuki XT225 and now Honda XR 400. ( A few scooters and other dead beats in between)
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Digit
Scooby Slapper



Joined: 22 Aug 2010
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PostPosted: 19:13 - 13 Oct 2010    Post subject: Reply with quote
I've had a kill switch failure in the past, might be worth a check.

Roy.
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Kal
World Chat Champion



Joined: 02 Jan 2007
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PostPosted: 00:07 - 16 Oct 2010    Post subject: Reply with quote
truslack wrote:
Reece, if you want a haynes manual, I'll send you one for the cost of postage.


Love to see the postage to Perth!! Smile

If I'd noticed this a couple of weeks ago I'd could have sent one out with my sister.

What I can do at some point this weekend is scan the pages you need from my Haynes, if that would help?

stinkwheel wrote:
Reg/rec shouldn't bother it. As long as there is power in the battery, it ought to run.

I'd check the pickup coil on the rotor and the wiring to and from it.


I like this. Mine died on a run. Chatted to sim at Lesters about it and he said the same thing, I was like it cant be for varius reasons. Unit looked intact when we pulled it out. Change of CDi and clicky thingy did nothing. Change of the yellow stargate unit and it fired up first time.

I want to know why I took it apart after that...
Sad

<edit> I might be tired and should probably stop using the interwebs now...
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Kal...
I Like To Hoon It Hoon It I Like To Hoon It Hoon It I Like To Hoon It Hoon It Ya Like To (HOON IT!).
1984 GB250 Clubman,1983 CB250N Superdream, 1999 GPZ500S
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reece1804
L Plate Warrior



Joined: 12 Oct 2010
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PostPosted: 15:03 - 17 Oct 2010    Post subject: Reply with quote
Kal, if you could scan the pages that would be great. Im thinking the pick up is faulty just need to check it properly instead of my usual (throwing parts at it) trick.
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