A generator (ger. Alternator) is a device where the voltage is induced and which charges the motorcycle battery. The generator consist of rotor (magnet) which has strong permanent magnets (#1) and stator having 18 coils (#2). The rotor is fixed to crankshaft axle and rotates with the crankshaft, and the stator goes inside magnet but is static and fixed to engine cover.
Cars generally use a single phase alternator. Simple, big, rugged, works well. In motorcycles the requirements are a little different, size and mass are more important. A three phase stator has three independent windings instead of just one. This offers redundancy as the bike will run as long as any two windings are good. Weight is reduced because three smaller, lighter windings produce more current than one, big, inefficient winding.
xv400/xv500/xv535
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| generator for Yamaha xv535 Virago - left rotor with ma + right stator with coils |
The rotation of rotor (permanent magnet) around the stator produces alternating magnetic field which induces the three-phase electromagnetic voltage on stator. This voltage is variable in frequency and in amplitude, according to the crankshaft and magnet rotation speed.
The rotor is reliable part of motorcycle and is not prone to failure. It is massive and with its inertia is used as flywheel as well. There are three generations of xv535 generators.
The rotor is reliable part of motorcycle and is not prone to failure. It is massive and with its inertia is used as flywheel as well. There are three generations of xv535 generators.
- The first generation uses:
- magnet with code F3T438 and
- corresponding circuit with two pick-up coils and
- corresponding TCI (code J4T020).
- Second generation uses:
- magnet with code F4T542 and
- corresponding circuit with one pick-up coil and
- second generation TCI (code J4T033).
- Third generation uses:
- magnet with code F4T549 and
- corresponding circuit with one pick-up coil and
- second generation TCI (code J4T033) but has new starter clutch (like Yamaha Dragstar xvs400/xvs650).
| Part | Code | Production period | Models |
|---|---|---|---|
| Rotor | 2GV-81450-20-00 | 1987-1990 | xv535 |
| 3BT-81450-00-00 | 1991-1996 | xv400,xv500,xv535 | |
| 4TR-81450-00-00 | 1997-2001 | xv500,xv535,xvs400 | |
| Stator | 2GV-81410-20 | 1987-2001 | xv400,xv500,xv535 |
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| generator rotor 3BT-81450-00 |
The generator (rotor and stator) reside on motorcycle left side under the engine cover. The generator stator works in harsh condition (in hot engine oil) and is prone to failures more than rotor. If stator coils isolation does not withstand this condition, the failure will occur. A service manual gives instruction that the resistance between every 2 wires of stator has to be cca 0,5 Ohm, and one should test it when stator is on engine's working temperature. There must not be a connection between coils and stator housing (ground).
Factory stator code is 2GV-81410-20 (1987-2001) and it was not changed from the beginning of Virago motorcycle production.
Factory stator code is 2GV-81410-20 (1987-2001) and it was not changed from the beginning of Virago motorcycle production.
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| generator stator 2GV-81410-20 |
xv700/xv750/xv920/xv1000/xv1100
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| generator on Yamaha xv750 Virago - left rotor with magnets, right stator, up pick-up coils (sensors) |
| Part | Code | Production period | Models |
|---|---|---|---|
| Rotor | 4X7-81450-21-00 | 1981-1983 | xv750,xv920 |
| 20X-81450-20-00 | 1983-1985 | xv700,xv750,xv920 | |
| 1RM-81450-20-00 | 1986-1990 | xv700,xv750 | |
| 3JL-81450-00-00 | 1991-1997 | xv750 | |
| 3JK-81450-00-00 | 1991-1999 | xv1100 | |
| Stator | 4X7-81410-20-00 | 1981-1983 | xv750,xv920 |
| 4PP-81410-00-00 | 1985 | xv1100 | |
| 1RM-81410-20-00 | 1987-1997 | xv700,xv750,xv1000,xv1100 | |
| 1TA-81410-20-00 | 1991-1999 | xv1100 |
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