'02 DT125R - Power Valve Servo No Power

liquid-snake

Hello all,

Having some difficulties with my power valve servo unit after building a new loom. The servo isn't cycling when the ignition is turned on I think it might not be getting power. I have a second servo which I have tried with this loom too but no joy. Looking at other threads here some folks have mentioned a potential CDI fault - is there a means of testing this?

For ref I have one of the servos with 4 block connector and separate white/red wire bullet connector.

The electrics were all good the last time the bike ran (July 2020). Loom was falling to bits though so I've built this new one. Been studying the Haynes manual and I'm pretty sure everything is where it's meant to be.
-Checked main fuse from battery and read switch under clocks both OK.
-Battery I think is OK but I'm a noob at multimeter stuff. Got a reading of 18.something when checking voltage.
-Neutral and oil light on dash when ignition activated so there's definitely a complete circuit going on
-Checked earthing point at the coil and it's secure

Would be much obliged if anyone could help out with this

Calum

Battery is reading 18 what?

If the battery is on the blink then often the YPVS doesn't operate properly. Should still attempt a cleaning cycle though.

liquid-snake

@calum err I'm not sure really. I'm very new to multimeter usage. I was going to say volts but it's only a 12v battery...

If this is a CDI fault is there a common cause? I had been running an LED tail light unit - could this have caused a short or something?

Looks like the CDI units for my model are in short supply currently. Is it possible to use the CDI from an older model and make up a loom accordingly?

Calum

@liquid-snake Well 18Vs at the battery is likely to fry some components. Not sure if the voltage is regulated after the stator.

So definitely get the right measurements first.

The bike should have a high 12V supply across the leads. This will actuate the motor on ignition on.

Also sometimes the motor is weak and/or there is some other problem. So just try removing the powervalve cables from the powervalve and operate it under no load. It might be fine.

So make sure there is enough voltage and remove any load from the motor.