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Old 06-26-2012, 04:00 AM   #1
johmarq OP
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Suzuki TS400 Spark Help!

Hi all,

I'm hoping there might be some Suzuki TS/TM gurus here that can help me with a problem I'm having with my 1973 TS400.

I just purchase it, She had been sitting for 30 years, and only has 385 genuine miles.

Did all the usual stuff, cleaned and lubricated, new oil etc etc.

Started right up on second kick.... yipeeee

over the next weeks started real easy, but today tried again, no start... fuel good but no spark.

Did the usual again, changed plug, checked leads and connectors, Kill switch etc.... still no spark

tested the coil, seems ok,

Now while stuffing around I noticed that after kicking it over, and getting no spark I happened to press the kill switch,

and there you go one full strong spark, but just one.

I can repeat it over and over, kick it over and then press the switch and get one good spark.

Now my question is .... has anyone seen this before?

Is it the CDI unit, coil or maybe a bad wire or earth?

really appreciate any help you can offer.

before I start laying out hard cash

while here does anyone know if the CDI units from other Suzuki bikes are compatible ie: PE, other TS or TM etc.

Cheers in advance

John
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johmarq screwed with this post 06-26-2012 at 04:08 AM
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Old 06-26-2012, 04:54 AM   #2
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First think I would do is disconnect the wire going to the kill switch AT the cdi unit plug. Could be as simple as a shorted switch.

Then check all connections and grounds, anything sitting for 30 years probably has some corrosion.
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Old 06-26-2012, 05:09 AM   #3
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Quote:
Originally Posted by PFFOG View Post
First think I would do is disconnect the wire going to the kill switch AT the cdi unit plug. Could be as simple as a shorted switch.

Then check all connections and grounds, anything sitting for 30 years probably has some corrosion.
Yep, I did that, the switch is good.
also have checked, cleaned and re plugged the wiring.
I will be testing the wiring with a meter tomorrow

Just don't get why I get a spark when pressing the kill switch
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Old 06-26-2012, 06:41 AM   #4
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Possible trigger coil is bad, been a LONG time since I played with these systems. Remember there is an energizing and trigger coil though. One charges the cap, one triggers it to discharge. It would make some sense that they discharge the unit when you hit the kill switch, to prevent an unwanted zap.
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Old 06-26-2012, 06:51 AM   #5
johmarq OP
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Quote:
Originally Posted by PFFOG View Post
Possible trigger coil is bad, been a LONG time since I played with these systems. Remember there is an energizing and trigger coil though. One charges the cap, one triggers it to discharge. It would make some sense that they discharge the unit when you hit the kill switch, to prevent an unwanted zap.
Hi Richard,

So, the fact that there is a charge there, Would that indicate that the CDI and coil are working correctly?
and if you think about it also the energizing coil as the charge has been sent to the CDI Cap.
Yes ....No???
will definitely look for the trigger circuit.
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Old 06-26-2012, 09:44 AM   #6
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Some things I would change when a bike has sat that long is change the main seals alway change them, on a sitter.
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Old 06-28-2012, 02:45 AM   #7
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Bugger Me, the problem disappeared!
I spent the morning chasing my no spark problem,
then after lunch and a break got back into it and stuff it it's working!
Put it all back together and it rides just fine
You just gotta love these old bangers!
Must be a bad earth or a broken wire somewhere.
I bet It will come back and bite me it the bum at the worst possible place and time!
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