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?