CDI unit fault symptoms

[xs1961]

Wondered what the symptoms of a failing cdi unit were..Ive only had a couple of TCI models in the distant past, never had any problems with them but recently I fitted a spare complete stock TCI system to mine. Its covered about 600 miles trouble-free but now I have a problem ,its never actually killed the motor but started to intermittently sputter/cut on load around 3-4000, like flicking the kill-switch on/off (extremely quickly)but not all the time. Get her cruising 4000+ & alls fine
Its NOT the kill-switch, Ive checked. Its not fuel/carbs (Ive swapped em to check, three sets) or rubbers.
She starts first kick, hot or cold
Although its both cylinders its not the coil, Ive tried a new one.
Could vibration damage to a diode cause this?

[tonyc2me]

Check your ignition switch.

[10ecjed]

A while back I thought I had problems with my TCI. I did a google search and foung info from 650 society or something, I can't remember. I replaced my diodes and transistor. Come to find out this was not my problem but at least I know they are new.This has to be done carefully, so if you do it, let me know, I can give you some tips.

[xs1961]

Well, today shes runnning perfectly...

No idea why, It could be the cheap on/off toggle switch I have in place of the ignition switch (good tip Tony),I rummaged around in the headlight bowl & re-arranged some wires & tightened connectors..

The CDI/TCI I fitted was hanging in my shed for 20 years so I had my doubtsabout its being fit for purpose, seems like I got away with it then
10ecjed, Ive just bought a spare cdi box (£15)from Theifbay , reckon Ill open that up & see whats involved re. future repairs(if needed)
Cheers