Servo motor issues
Hi, new to this site, I have recently picked up a 2002 DT125R. I have had a bit of a look over it and the wiring has been messed with but everything works as it should, although the side stand switch is not there.
I have bought the correct servo unit and plugged it in. When turning the up ignition on, it turns about half a turn the. Jiggles back and forth 5 or 6 times then stops (without the cables connected)
If in disconnect the red and white wire, the servo turns a full rotation (or there abouts) then does it again, then nothing.
I have tried a couple of other Yamaha servos which look the same but have different connector plugs.
They both do exactly the same.
Any ideas before I go chasing the wrong part to try next?
Thanks in advance.
Calum last edited by
@tony-k-wales I had a similar issue when my Zeeltronic ignition system went faulty and the CDI just failed to operate the servo correctly. Zeeltronic replaced the ignition system under warranty and the problem went away.
Sounds like the CDI unit. I’m no expert on later wiring though...
@calum thanks for the reply, that reassures me somewhat.
Do you think I should keep an eye open for a replacement cdi/ igniter or are there aftermarket parts available still or at all?
@spookdog thanks for the reply, I read somewhere else, I think on this forum, that a faulty Cdi/ igniter could be the cause. Finding another is my next mission by the look of things
Check your markings on the CDI. There’s a few different types, even sub variants.
@spookdog thanks, I will. I think I have found the right one. There was also one in Germany that a chap was selling, he sent a link to a German forum where a chap had de-restricted a 3RM-10 to a 3RM-20 by adding some sort of switch in place of the Reed switch. I think the Google translation is losing exactly what it is though!
You just need to remove the switch/sensor far enough away for it not to affect. I think google translation can only do so much!
The difference I think, between the rm/ 10, 20 & 30 is how high each one will rev after derestricting...
I have the first CDI unit made in 88, (3NC?) it only revs to just over 10,000
I spent a while trying to figure out why my Dtr wasn’t redlining @ 13,000 like everyone else
MadGyver last edited by
@spookdog I have 3NC-00 on my DTR and is revving a little over 11000rpm with Athena 170 kit when driving,parked and full throttle went up to ~13500rpm.
@spookdog thanks again for the info. I have found a 3RM-30, will try it this weekend if I’m lucky.