i am going to try to turn this post into a complete electrical and testing of electric components
as i am learning more about electrics myself.
if your interested in learning motorcycle electrical repairs i recommend this book from Amazon UK its excellent, I have read it now 4 times over and over trying to master it if you read this and absorb it you will be an expert on your bikes electrics , reading your manual is too complicated.
Aprilia RS 125 Charging , generator , alternator , stator testing
Aprilia RS 125 flasher unit testing
Aprilia RS125 starter relay testing , how to rs 125 .
Aprilia RS125 Pick up coil testing
Aprilia RS 125 HT ignition coil testing
Kokusan Motorcycle Electrical component descriptions
Aprilia RS 125 electronic ignition system
Aprilia RS 125 No spark - Not sparking troubleshooting
.png "Aprilia RS 125 wiring diagrams - electrics RS125")
If you have a voltage meter you can do some basic tests.
When the engine has been off for at least 1-2 hours with ignition key turned off,
100% Charged 12.60 to 12.8v
75% Charged 12.4v
50% Charged 12.1v
25% Charged 11.9v
0% Charged less than 11.8v
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Aprilia RS125 stator , alternator
charging circuit diagnostics video
non spark diagnosis
Electrical problems post
low battery , faulty battery. these batteries are fairly poor and if left for long periods without riding can go flat and fail to recharge again needing replacement i used to keep old battery but always found when i come to use them they were completely dead beyond reviving
do not know why this is must be some scientific reason for it but i have no idea .
try to run the bike regular or remove battery for trickle charging for periods of long parking or replace battery if you just bought bike and struggling with power.
Another problem can be faulty contacts in the wiring loom (block connectors) i always slit these put an electrical contact cleaner in them to ensure good contacts throughout the whole loom.
id do this yearly as rain , moisture can affect these joints causing a white powdery stuff to form again no idea what this stuff is.
if the bike fails the turn over but clicks and you battery is well charged , this is likely to be the relay situated near the radiator this is a device to turn the low current circuit of the starter switch into the higher current circuit of the starter motor but they are shit
i hate relays tbh they seem to cause more problems than enough especially on modern cars .
basically this about it i have always found if you buy an old rs125 as long as the compression is good (ie piston rings good)
if you clean out the carb and jets ,replace old fuel with new fresh fuel , fully charge the battery or replace , make sure all electrical connectors are cleaned and fitted nicely add a new spark plug then there should be no problem firing up .
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