CDI Computer Box Issue

dailywarren

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Dailey
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I ride a '99 Legend TT 900
My shop guy (trustworthy) believes the CDI box might be bad on my 1999 TT Legend 900. Carbs are clean, everything else checks out, but the bike will run until it gets warm, die, cool down, then start right back up. And it looks like the CDI box has already been replaced at least once, so I was wondering:
- is this a common problem for the Legend?
- do I have to get this specific CDI box for this bike or can I use a CDI box from, say, a Bonneville?
- should a Triumph dealership have a diagnostic computer to verify this is the problem?
Any help would be greatly appreciated!
Thank you
 

Greyfell

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Stephen
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2008 Triumph Bonneville T100 Ann-Margret
Test CDI:

Repair CDI:
 

Qship

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Steve
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'17 Tiger Explorer XRT
Don't think a CDI box for a Bonneville will work as yours is a triple and the Bonnie a twin. Could be just a bad pick up sensor on the crank or camshaft, wherever it is located on your bike. Something else to look at
 

Gandolf

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Derby
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steve
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1960 Bonneville T120
My shop guy (trustworthy) believes the CDI box might be bad on my 1999 TT Legend 900. Carbs are clean, everything else checks out, but the bike will run until it gets warm, die, cool down, then start right back up. And it looks like the CDI box has already been replaced at least once, so I was wondering:
- is this a common problem for the Legend?
- do I have to get this specific CDI box for this bike or can I use a CDI box from, say, a Bonneville?
- should a Triumph dealership have a diagnostic computer to verify this is the problem?
Any help would be greatly appreciated!
Thank you
Before you go and waste money, see if you can borrow one to try first, its a simple job to take off and try, i ended up replacing ht leads coils pick up plugs etc on mine, all to no avail, i borrowed a black box which was not the problem, in the end i took the carbs back off and found a jet had come loose and was in the float bowl. I had taken the carbs off in the first place to replace main jets and clean, But obviously i had not tightened one of them up tight enough.
 

Larryblag

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Derby, UK
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Philip
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2021 T100
Don't think a CDI box for a Bonneville will work as yours is a triple and the Bonnie a twin. Could be just a bad pick up sensor on the crank or camshaft, wherever it is located on your bike. Something else to look at
If you have (or can borrow) an oscilloscope you can see if the pulse from the pick up sensor is good. It should be a nicely shaped square wave of appropriate amplitude. I had this issue on a Fiat Punto which was getting very difficult to start. I swapped the TDC sensor and all was well. The one I took off looked like a hedgehog with all manner of magnetic detritus sticking to it. This was damping the pulse to the point where the ECU couldn't "see" it. I kept it as a spare - it wasn't worth reinstalling as the replacement was only a tenner
 
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