Bad stator or R/R ?  By  daven68 (Read 6,882 times)

Have to find it but I believe we have how to test which one is the CULPRIT the Stator or the R/R.

You can find out if it is chargeing or not , start it up and rev it up a little and see what the battery reads it should show the voltage going up over 13+ as you rev it up.
And yes yours appears to be a DC CDI if you disconnect the battery and it dies.

If not JR knows how to test to find out which one is the CULPRIT the R/R or the stator.
Alleyoop

Found it:
thescooterprofessor.proboards.com/index.cgi?board=elec&action=display&thread=87

Total DC system, unhook the battery or dead battery = no run.

Stator test:

thescooterprofessor.proboards.com/index.cgi?board=gele&action=display&thread=1140

Also one thing all are forgetting, this scooter has the blocking diode, if it is bad (open) then no charge to the battery.

It's the little small aluminum box right by the R/R and has two wires.

Simple test of it, just unplug it and jump the two wires together that plugged into it. Don't pannick the headlights will immediately come on.

Start the scooter and test the voltage output on the battery again at idle and revved up. If it's 13.5 Vdc or above you've found the problem. If not then test the stator and go from there.

JR

wow, talk about total luck out...We discovered the R/R was disconnected.

Problem solved. Tested at 13.89. Not sure if we did it, or the shop he had it in recently forgot to connect it back. But who cares, we're back on the road, and going now to put his bike under a more stressful test for the overheating, which we believe is also fixed. We'll know more in about a couple hours.

And JR, his bike does indeed run with the battery disconnected. We tested that too, once the R/R was plugged back up and started the engine. Now a bizzare problem: he shut the key off, and the engine kept running till he hit the kill switch.

Point blank you've got the remote on and that's the reason it will not shut off with the key AND the reason it will run with the battery disconnected.

What happens when the remote is on voltage is supplied to the CDI via the black wire from the ignition which gets 12 volts from the red wire that comes off of the R/R. The remote actually bypasses the key switch and can be on and take away your key function.

You have got to reset your remote or unhook it and in this mode the scooter can be dangerous because it has been known to reset itself running down the road and instantly kill the engine. Not fun if your'e going 60 MPH.

This is a DC powered CDI unless someone jury rigged a AC one in and I doubt this.

Wire colors to the CDI are

gray/white = kill wire
green = ground
red/white = pulse wire from stator to CDI
yellow/black = coil feed wire
Black = 12Vdc from ignition = CDI hot wire.

Unplug the black wire test it for 12 volts and watch the scooter NOT run or even start.

If the remote is not the problem then the black wire is crossed with the red wire and getting voltage all the time.

JR

Here is something that might help a lot and it's the wiring diagram:

thescooterprofessor.proboards.com/index.cgi?board=250g&action=display&thread=430

Your scooter is the first one listed the yy250t scooter. Cruiser and I made this diagram and went by his scooter a exact copy of yours. The CDI module send power to your coil so the spark plug will fire. It is generally located under the seat (is on my scooter) or by the coil and R/R area.

Here is a picture of it;



When scootforrun said the scooter would run with the battery unhooked it tells me you've got something wrong. Now most of these come with a remote and most people just unhook them. The remote module is generally located behind the headlights.

On the CDI the black wire is the power wire to it and again supplies 12 volts to the unit. It is DC and does not get it's power from the stator like a AC powered unit does.

So if your scooter will run with the battery disconnected then you've got a issue.

JR

Thanks JR, we will look into this further. Question, does it matter that my scooter is a yy250t-2 not just a yy250t and what is the difference?