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Discussion Starter · #1 · (Edited)
Thought I'd post this up, to see if anyone has had a similar issue. A few weeks ago, my 1994 TA suddenly stopped firing on one cylinder. It had been running spot on when I put it away in the garage. Came to start it and it would only run on the front cylinder. I checked the CDi, and sure enough, it appeared to be a duffer. I'd read that this was a common problem with TAs so I bought a new pair of CDis...one to replace the duffer, the other as a spare. All seemed fine for several weeks (weekend rides, various distances) until the other CDi crapped out. Replaced that and all was well again.... until last week! Bike had been standing for a week in the garage. No spark. The engine turned over fine, but definitely no sparks. Pulled the seat and side panels, checked the wiring, pulled the spark plugs....disconnected and reconnected the CDi plugs and it fired into life! So...must've been a poor connection or so I thought, even though the plugs and terminals are spotless and the wiring appears to fine. Went for my ride (c. 100 miles without missing a beat), came back, garaged the bike as usual. Came to start it this Sunday (for the Remembrance ride around the M60) and it wouldn't start again! Neither of the CDis would fire up. As a last resort, I thought I'd try the 'duff' original CDis that I'd replaced....sure enough, it fired up....and ran like a champ!

So, if you've managed to stay awake this far: a recap



Suspect faulty CDi units replaced with new ('fault' was verified by substitution, observing spark/no spark at the plugs)
New units good for several weeks
Both new units now don't seem to work at all
Original 'faulty' CDis now seem to be working fine

Before I delve, armed with multimeter, into the mysterious world of intermittent electrical problems, has anybody had a similar issue with their TA or AT and could save me hours of faff?

The obvious answer would be poor cabling/problem in the loom, but this wouldn't explain why both new CDis now appear to be fooked, and the old CDis (which appeared to be fooked) now seem to be perfectly fine....it's an odd one :confused:

NB/ they are the correct replacement units for a 600 with side stand switch

Hope someone can help. Ta
 

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mm.. that's an odd one.

i have had something similar, ie what I thought was duff CDIs working again

I would squirt electrical contact cleaner into the CDI connectors and clean with an old toothbrush

and/or, run the bike with the seat off and wiggle the CDI connectors around

it does sound like a CDI issue. the coils etc very rarely fail on these bikes

see

https://www.google.co.uk/search?q=e...JMAKHYZiBk8Q_AUICigB&biw=1153&bih=578&dpr=1.1
 

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maybe squirt the stuff into the spark plug caps too

or it could be old spark plug HT leads and damp getting into them, check they are not cracked at all. but given they are 24 years old, they may have just worn out and broken down inside so the spark isn't getting through as well as it should
 

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What about duff ignition pickups or the connection where they connect to the loom?
Anything like this is going to be trial & error.
Duff earth, bad loom or connector maybe one or two of the cdi terminal pins need nipping up a bit - have you tried giving a wobble when it's bad to see if it comes good?
Could it be a fuel flow/tap issue/sticky float valve?

Sent from my SM-A320FL using Tapatalk
 

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Discussion Starter · #6 ·
Thanks for the suggestions Gents. I'm going to test the coils later this evening, and I'll have a bit of a poke around the loom and connections. The odd thing is that both the original CDIs 'seemed' to fail within a week or so of each other, and the new CDIs 'cured' the problem....now both new CDIs 'seem' to have failed and the old units are working properly....this is why I reckon it may be to do with the crank sensor, or associated connections: if the CDIs aren't seeing any signal, it's as if the engine isn't turning....
 

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Try wobbling the cdi connector or disconnecting & reconnecting to the same cdi.

It does seem odd how a seemingly duff cdi on the last ride becomes good when refitted, until the next ride!

Sent from my SM-A320FL using Tapatalk
 

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Try wobbling the cdi connector or disconnecting & reconnecting to the same cdi.

It does seem odd how a seemingly duff cdi on the last ride becomes good when refitted, until the next ride!
Yes indeed .... I'd wonder if the CDI connectors were securely attached to the wires, and whether the wires themselves had suffered any damage through crushing, or bending, or corrosion, or wear through rubbing on the frame.
 

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I don't know an awful lot about electrics but this much I do know there is nothing to fear its not black magic like a lot of us would have looked at it . you have to tackle it one wire at a time and check them for continuity I think . I remember a bloke having a similar problem on hear and it was the pick up coil for the coils that go on the end of the crankshaft like where points used to be it could be coils ht leads caps is the bike charging properly . . I don't know how to check them though a workshop manual and good multi meter one that does everything . I bought a draper I have it years it don't get an awful lot of use but its lasted well I mind it and store it in the house to keep out damp but it has limited capability . so if anyone is buying one study them and get the better one . we are lucky to have the internet these days will all the shared knowledge . an ask for help with a problem can help others in years to come as the problem gets solved . try searching the forum to see if this has been solved before . good luck with it . a bloke told me one time electricity is like water it flows and wires are only circuits that are like pipes so if you have a problem you isolate where it could possibly be and check them then there is different components some are easy check with a multi meter but some need specialist expensive machines . a bloke in a battery shop bough out a machine worth 2000 euro to test my old yuasa out of the transalp it wouldn't hold a charge any more its cold cranking amps had dropped to 90 . but I didn't need a fancy machine to tell me it had lost its mojo .
 

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Discussion Starter · #13 ·
I didn't get round to testing the wiring last night, but the engine fired up first blip this evening (from cold) with the old CDIs connected. Everything stops for the new Peaky Blinders series ( :cool: ) so it'll be tomorrow eve before I have a tinker. On the plus side, if it turns out it's just a bad connection, and the new CDIs are actually OK, then I've got two spare CDIs....and I'm a bit wiser:thumbleft:
 

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Hi Jonathan Check the Kill Switch I Had 2 Fail on me when i Had my 600 Transalp, Also when the C.D.I.s are in Place Do the Wires Point upwards OR do they Exit Horizontal ? . If they Point upwards when the Seat if Fitted and you are Sitting on the Seat ,The Seat Pan Pushes Down on the wires and this Causes the C.D.I. To Fail. A upgrade Bracket which allowed the C.D.I.s to be fitted Sideways Can be Bought from Honda.Hope this Helps. Francis
 
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Discussion Starter · #19 ·
Well....I had a poke around and couldn't find anything untoward. All the connections are clean, earths are good, coils are in spec...

The bike doesn't start with the new CDIs, but starts and runs fine with the old units, so I'm non the wiser. It's a '94/5 so it had the upgraded holder (as in the pic above).

I'm struggling to come up with a plausible reason for the non sparking issue, unless it's a creaky wire in the loom.

Thanks for all your suggestions:thumbright:
 

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are you sure they are not faulty new CDIs? i have heard stories about cheap aftermarket ones that just don't work.

it does sound very strange.

or somehow you have "fried" the new CDIs, but that sounds very unlikely
 
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