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Discussion Starter · #1 ·
Hello,

I'm looking for a replacement CDI unit - stamped "NIPPONDENSO 070000-0261" It would seem that this model of CDI is not very common.
Most CDI units for CB400TII 78 model are stamped with different numbers. i.e TIA01-20
Can I use these other units or do I need to find the exact same model?

Thanks
 

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I'm not aware of any manual trans bikes using the Nippondenso CDI, those are only found on the A model in the US. The Hitachi CDI is used for manuals here, that T1A01-20 number.
Does you current CDI have any extra unused wires? An A model has more connections than the manual version.
 

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Discussion Starter · #3 ·
Total number of wires out of the unit is 8 and they all have a place to terminate
Green - coil
Yellow - coil
Black\white - to the headlight loom
Blue - CDI supply
White - CDI supply
Green - pickup
Pink - pickup (should be brown?)
Light Blue - pickup

I found this one on ebay UK its for a CB250. https://www.ebay.co.uk/itm/Ignition...B-250-070000-0261-30400-414-014-/232388326857

My FN is CB400T-4066793

Its all a bit wierd. why a completly differend CDI then most?.... unless the previous owner changed it.
 

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Working from CMSNL part numbers the correct CDI is 30400-413-015 which was superseded by 30400-413-305. This is a Hitachi brand CDI. The 413 code is for the CB400 manual transmission models, 414 is for the CB400 A models.
The number of wires out of the CDI are wrong. There should be 9
One Black w/White with a female bullet connector
One 2 wire connector with Green and Yellow, connector is parallel spades
One 2 wire connector with White and Blue, connector is parallel spades
One 6 wire connector(only 4 used) with Green and Brown parallel to one another at one end. Pink and Lt. Blue parallel to one another at the other end.
201_4136 (1).JPG 201_4135.JPG
 

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Discussion Starter · #5 ·
My CDI is missing the Brown cable on the 6 pin connector.
There is a brown cable on the stator side "male".
I've got the wrong CDI!
That's good... i think.

Question: if my primary pickup "brown" cable is missing on CDI, how was my bike running at all?
CDI2.jpg
CDI1.jpg
I better pull the flywheel off and have a look.
 

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Well now we have the answer for why your timing was at full advance. The CDI wasn't getting a signal from the primary pickup and was using the signal from the advancer pulsar to fire the coil.
 

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Discussion Starter · #8 ·
Hi Jim,

I'm reporting back success on the CDI issue.
I purchased the unit from CDI Magician on ebay. Bolted it on, kicked her over and she has never sounded so good!
Who would have guessed the previous owner put the wrong CDI on.

Thanks for your help
:D Huge win !
 

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I'm not aware of any manual trans bikes using the Nippondenso CDI, those are only found on the A model
The NipponDenso CDI 070000-0261 is the correct one for CB250T (manual transmission). It should be combined with the matching NipponDenso rotor&stator set for CB250T.
The NipponDenso CDI model number for CB400A ends with -0271.
 

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The NipponDenso CDI 070000-0261 is the correct one for CB250T (manual transmission). It should be combined with the matching NipponDenso rotor&stator set for CB250T.
The NipponDenso CDI model number for CB400A ends with -0271.
OK, we never saw the 250 over here so that explains the different information. Good to know
 
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