TCI (Transistor Controlled Ignitor) is an electronic circuit which controls ignition timing (exact moments when sparks are ignited within engine cylinders). The info about piston position within 4-stroke cycle TCI receives from pick-up coil(s). The pick-up coil is a sensor (two pick-up coils exist in older version of ignition system) residing under the left engine cover close to rotor (magnet/flywheel) which tracks rotation of rotor (it is in sync with crankshaft i.e. piston position in cylinders).
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| the sketch of ignition system |
In idle mode, the spark is ignited before a piston reaches the top dead center (TDC) - point of maximal compression. This initial point of igniting the spark before reaching TDC is called BTDC (before TDC) and usually is expressed as a rotation angle before TDC.
The so called ignition schema (curve) is built inside the TCI - that is data when exactly ignition spark should be ignited according to current engine conditions. By receiving impulses from pick-up coil TCI knows what is the engine rotation speed and according to predefined values from ignition schema adjusts the moment of ignition in order to satisfy the optimal burning and engine operation. TCI is closed assembly (black box) and one cannot tune it.
In Yamaha Virago motorcycles the ignition system components are produced by MITSUBISHI corporation. Mitsubishi produced TCI, rotor (magnet) with exciter(s), and pick-up coils (sensors). Every Virago production generation has its own combination of these components and one cannot mix them. So, if motorcycle xv535 (production period 1987-1990) uses an older ignition system TCI, then it also has to use corresponding older magnet and two pick-up coils, and vice versa. TCI intended for ignition systems with one pick-up coil on xv535 (production period 1991-1996) will not work with two pick-up coils (sensor). Therefore, the components in ignition systems must be paired according to production generations.
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| Yamaha xv500 Virago TCI - under the seat (Mitsubishi prod code J4T039) - 4FT-00 4FT-82305-00-00 |
On xv500 Virago model TCI is located under the seat (as shown on image above) and on xv535 Virago model it is under right side cover (as shown on image bellow).
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| Yamaha xv535 Virago TCI and relays under right side cover |
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Internal parts of J4T033 (xv535 TCI new generation). The assy has integrated circuit MH63801V1P and output transistors : D1071 (2SD1071) manufactured by Fuji (TO-220AB housing with coolers).
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| Yamaha xv750 Virago TCI - 3JL-82305-00-00 |
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| 1 = gray = induction coil - cylinder #1 2 = not used 3 = red/black = +12V 4 = orange = induction coil - cylinder #2 5 = blue/yellow = side-stand cut-off switch 6 = black =ground 7 = not used 8 = black = pick-up coil 9 = blue/red = fuel pump relay 10 = gray = pick-up coil |
| Code | xv125 | xv250 | xv400 | xv500 | xv535 | xv700 | xv750 | xv920 | xv1000 | xv1100 |
|---|---|---|---|---|---|---|---|---|---|---|
| 5AJ-82305-00-00 | 97 | - | - | - | - | - | - | - | - | - |
| 5AJ-82305-20-00 | 98-00 | - | - | - | - | - | - | - | - | - |
| 2UJ-82305-00-00 | - | 88-07 | - | - | - | - | - | - | - | - |
| 3JB-82305-10-00 | - | - | 91-94 | - | - | - | - | - | - | - |
| 4TR-82305-00-00 | - | - | 95-99 | - | - | - | - | - | - | - |
| 22U-82305-20-00 | - | - | - | 83-87 | - | - | - | - | - | - |
| 4FT-82305-00-00 | - | - | - | 92-98 | - | - | - | - | - | - |
| 2GV-82305-20-00 | - | - | - | - | 87-90 | - | - | - | - | - |
| 3BT-82305-00-00 | - | - | - | - | 91-03 | - | - | - | - | - |
| 4X7-82305-21-00 | - | - | - | - | - | - | 81-82 | 81-82 | - | - |
| 42X-82305-20-00 | - | - | - | - | - | 84-87 | 83-90 | 83 | - | - |
| 3JL-82305-00-00 | - | - | - | - | - | - | 91-97 | - | - | - |
| 42H-82305-20-00 | - | - | - | - | - | - | - | - | 84-88 | - |
| 1TA-82305-20-00 | - | - | - | - | - | - | - | - | - | 86-90 |
| 3JK-82305-00-00 | - | - | - | - | - | - | - | - | - | 91-99 |
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