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Joachim wrote: The cheapest reason would be that you have just to much liquid in your battery

In most cases, the generator itself is not the reason.
There is a voltage regulator which makes the right voltage for the battery, from whatever the generator is producing.
Did you have (or can lend) a voltmeter? A cheap one would be ok. Just connect the two wires to the battery (red on +, black on -)
switch to DC Range 20Volt. Start the engine and rev it up.
Voltage should be about 12,8V at idle and maximum 14,5Volt at high revs.
If you read more.... damaged regulator. This will boil your acid in the battery.
The cheap possibility could also be bad contact at the regulator connections.
You may clean the connectors. Also check the ground wire.
If the regulator is dead..... you will need another (new) one. Modern regulators can neither be adjusted, nore repaired.
At least not with usual home toolings.
The brand of the battery doesn't matter. Varta usually is a good, but also rather expensive one.

Good luck, Joachim

Hi Joachim!

Well.... 1st of all.... many thanks for your precious suggestions!

I mean.....

I've checked voltage on my Gilera XR1.... and:
- light off -> from 1500 rpm to 7000 rpm -> from 14,5 V to 14,8 V
- light on -> from 1500 rpm to 7000 rpm -> from 12,5 V to 12,8 V

I think it's perfect!
What do you think about it?

I think that I had just to much liquid in my battery...... as you said!

Ciao

Marco

gileraXR1 wrote:What do you think about it?

I think that I had just to much liquid in my battery...... as you said!

Joachim wrote:

gileraXR1 wrote:What do you think about it?

I also think this should be ok

I think that I had just to much liquid in my battery...... as you said!

Maybe.
You should just have an eye on that.

Joachim

Joachim wrote:The original reeds are made of metall?
Later ones are from some kind of fibre plastics.
You have got carbon fibre ones?
If not... i know where you can get them

ciao Joachim