Here's some single phase rectifiers that are powerful
and easy to mount:
MB254 25-AMP 400-PRV
MDA990-6 30-AMP 600-PRV
NTE5326 25-AMP 600-PRV
GBPC3506 35-AMP 600-PRV
All of these mount on any flat metal surface as
heat sink and handle 400 to 600 peak reverse voltage.
Search Google for suppliers Jameco, Mouser, Digi-Key etc.
They run about $3 to $6 each.
About overcharge ... if your stator can do 10 amps at full
throttle and your headlamp uses 5 amps and your running and
tail lamps use 3 amps ... then there are only 2 amps left
over and that is the standard current a lead acid battery will
use when it is doing a trickle charge .... and that is at full
throttle. A battery can charge all night at 2 amps and just be a
charged battery in the morning. Your butt probably can't sit on
a motorcycle for enough hours in a day to do any serious over
charging of a battery. At least you'll find out what the maximum
capability of your stator is.
It all depends what the electrical loads are and the average rpms are.
Yes .... a regulator would be ideal .... but with weak stators not
really a necessity.
The thing to do is go to Harbor Freight and buy a cheap digital multimeter
for about $6 ..... duct tape it to the handlebars ..... ride the bike and
watch the voltage. If the voltage climbs over 15, 16 or 17 volts then you
are over charging. But as a test you won't damage that big battery.
You'll be able to tell .... the battery will get warm and you'll smell the
sulphuric acid.
I really don't know how much current your headlamp pulls or what other
electriacal loads you have .... those meters also have a 10amp ammeter
built in you can use to test the draw of your appliances.
The truth is these Yanclone engines were designed for stationary engine
use with a simple 10amp stator to charge only the battery. It's gonna take
a little energy management and maximimation of the sator output to get
satisfactory results on a motorcycle.
TnFan