The alternator on a bike is likely to be less powerful than a car one as it has less work to do. On a car there are at least twice as many lights to power and the battery has a larger capacity so will often require more current to charge it. On a bike you have one front position lamp (5W) one dipped beam headlight (55W?) one main beam headlight (55W?) one rear position lamp (5W) and one rear brake lamp (21W?) plus four indicators at 21W each but only lit for half the time they're in use and then mostly only in pairs. Even if it has electronic engine management the current required is likely to be lower than that of a car which has multiple ECUs.
If your battery is tired then it will also drag the voltage down.
D.
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