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Author Topic: '78 cb400t II  (Read 3419 times)

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troy

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'78 cb400t II
« on: December 16, 2008, 03:34:02 PM »
hello everyone...new to this site.  im fairly mechanically inclined.  ive owned a '73 cb350, '76 cb550, and currently have a '82 cb750 dohc...all ive had to fix before riding.  i just picked up a '78 cb400t...the guy that i got it from tried to jump it off with a car battery, i know, why didnt he kick start or push start..who knows...anyway now there is no spark at the plugs.  i really havent started troubleshooting yet...i figured i would start at the plugs and work my way backwards to caps ,wires ,coil , cdi..etc.....but if anyone has done/seen this before, a push in the right direction would be appreciated.thanks.T
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Offline scunny

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Re: '78 cb400t II
« Reply #1 on: December 16, 2008, 03:47:56 PM »
did he blow the fuse, check there then to coils
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troy

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Re: '78 cb400t II
« Reply #2 on: December 17, 2008, 05:15:46 AM »
no the main 15a fuse isnt blown...1st thing i checked.  someone suggested the stator may be bad. but stator is part of charging, not ignition..right??
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Offline Uncle Ernie

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Re: '78 cb400t II
« Reply #3 on: December 17, 2008, 05:50:07 AM »
I've jumped from cars lots of times- you just have to be sure the car isn't running.
The obvious question to me is- what shape is the battery in?  Is it at least clicking, or is it dead silent?
Check the kill switch. (hey- I've done it more than once...)
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troy

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Re: '78 cb400t II
« Reply #4 on: December 17, 2008, 12:25:58 PM »
i put a brand new battery in it...the lights, horn, neutral and oil lights work.  the starter cranks the   engine over.  i tested the plugs with my cb750 and they work.  did this model have a condersor?
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troy

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Re: '78 cb400t II
« Reply #5 on: December 17, 2008, 12:27:56 PM »
by the way ernie...i live in hendersonville.
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troy

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Re: '78 cb400t II
« Reply #6 on: December 17, 2008, 08:13:46 PM »
ok...disconnected cdi from coil...when started, getting a spike of 24v, then bleeed down to 12v from cdi side.   with coil connected...zero voltage thru the coil to the plug caps when started.  17k ohms thru coil...its open!?   .manual says normal 3k-5k ohms...anyone got a coil?!?....seriously...throw some parts my way....
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Offline cb650

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Re: '78 cb400t II
« Reply #7 on: December 18, 2008, 04:35:14 AM »
Whats the coil look like?   I have some 650 coils laying around that are cdi.  One coil fires 2 cyl.
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troy

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Re: '78 cb400t II
« Reply #8 on: December 18, 2008, 09:45:02 AM »
coil model # is FL102-12v 8.1...two wires, yellow and green, connect to output of cdi.  cdi model # is TIA01-20..
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Offline cb650

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Re: '78 cb400t II
« Reply #9 on: December 18, 2008, 04:37:31 PM »
I'll check one out this weekend.
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18 grand and 18 miles dont make you a biker
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