DT125R FORUM

Forgot to mention I paid 1500 and it owes me another 100 in fuel and parts so that what I am looking for


So I had another look at the old girl today and decided I just dont have the time (or enthusiasm really) so I am going to sell it as a complete lump that is an ongoing project if anyone on here is interested you are welcome to have it otherwise I shall list it on evilbay in a week or so

Wow making a loom has never been on my to do list I bloody hate electrics give me nice mechanical carnage anyday
So as far as the deet from hell goes, I refitted the rotor plugged all the connectors back in and fired it up - multimeter across the battery 11.8v -BUGGER!!!!!
Unplugged the rectifier and checked the phase wires - out put on 2, 3rd one still dead stator is knackered despite looking good - I did a continuity check on all three phase wires and have continuity all the way up to the rectifier multi plug suddenly the buying a 12 segment stator rotor and a taper shim is not so mad expensive any more although the temptation to just shelve it until after Christmas and break it is strong, just get my investment back

Thanks for that Hotshot, haven't had chance to act on any of it today - hopefully will get chance over the weekend

So got about as far as I can with the 250 til I get some stuff back from paint so I will have to turn my attention to the ginger stepchild again tomorrow, anyone got a pre 2004 wiring diagram they could share so I can look at how (if at all ) possible it is to fit an earlier CDI

I decided to concentrate on my other project today, feeling a bit fed up with the water cooled ungrateful Yamaha

Good spot, thats exactly what the donor chassis was.


By jingo I think I have got it!!

![alt text](image url[img]https://i.imgur.com/WMVHrzb.jpg[/img]

Tried and failed I think?

![alt text](image urlhttps://i.imgur.com/WMVHrzb.jpg

1500 quid

Wowee 69 european pounds for a shim then a cover a rotor and a stator, sounds like heaps of money to me.
I will see what the whole lot is going to come to and go from there

@Calum said in Hello all:

@mcludd I literally fixed and then @ you about how to embed photos #12.

I appreciate the fixing but I haven't a clue what (www.example.com/image.jpg) means I'm afraid

Making some progress I think, I checked the phase wires from the alternator and got 20v, 30v and zero!!!!!! thats a phase down then, so I took off the rotor (no thread for an extractor but 3 M8 jacking holes, I used one of these and managed to miss the windings gave it a clunk with a hammer and it fell off on the floor. Here's where it gets interesting, instead of a 12 segment plus HT stator there is a 6 segment plus HT also no sign of any burnt windings
[img]https://i.imgur.com/etmh7JU.jpg[/img]

Must be a break in continuity between alternator and rectifier then I think so I start to have a dig in the wires and FFS!!!!
[img]https://i.imgur.com/ydrP70S.jpg[/img]

So an hour or so later shrink wrappery and solder
[img]https://i.imgur.com/jLWlxqx.jpg[/img]

Brilliant all done you might think, well errr not so the diagram shows that there should be a further wire coming from the alternator up to the CDI (green/blue) and I have it making the journey from the multi plug to the CDI but not coming from the alternator - BUGGER!!!!!

[img]https://i.imgur.com/ct10W8V.jpg[/img]

So here's my thoughts, this is an earlier engine (no electric start no sprag clutch no hole in the cases for a starter motor) with an earlier engine which due to the lack of I assume signal wire to the CDI is not compatible with the CDI I have, my options are as far as I can see fit a later model rotor and stator. graft an earlier model CDI (possibly an earlier wiring harness?) Break the bugger and cut my losses

I had a transit battery jump leaded to it and with the engine running it was showing 12.6v but no increase with revs so I disconnected the transit battery and went back to the deet one alone which was now at 11.7v and again no voltage increase with revs, need to see if there is anything coming out of the alternator phase wires next (I suspect not) if thats the case then the stator is goosed or if there is then the rectifier/reg is done for - will see what tomorrow brings if I have a spare hour

I bought an NSR 125 a few years ago sight unseen from evilbay, jesus what a mess when I collected it obvious 17 yr old negligence - every consumable on the bike was worn to a depressing degree tyres, brakes, chain, sprockets, air filter, piston, rings, battery,small end bearing, fork seals. along with needing a repaint and decals I bought it for something to tinker with over winter and also for the satisfaction of saving a smoker from the scrap heap (where it certainly was heading if I hadn't stepped in) so when it was Mot tested and finished I stuck it back on e bay and I think I ended up 80 quid in front on the deal. The deet is a similar project I dont really want a DT 125 as a serious bike but it is certainly worth saving just its a complete bugger and resisting my helping it

Well had another round with the Deet from hell, I was following a wiring diagram from the internet but it looked OK it showed 2 x 6 wire connectors and 1 x 4 way connectors going into the CDI which is what mine has anyway what I found was there is a 12v feed going into the CDI on ignition live through the black blue wire from the servo connector there is also a 12v feed comes from the black red wire coming from the alternator when the engine is running, also found out my new old CDI doesn't spark when encouraged so that is totally useless and obviously its going back the other thing I found was that it seems there is no volts coming out of the alternator with the engine running so probably a dud stator but still to pull the flywheel to investigate that one.Oh and the red wire, this best I can tell was a live supply to an optional alarm which I dont have so I have blanked it off
Anyhoo to summarise I have a replacement duff CDI my original CDI which may or may not be any good servo wise but it does make sparks unlike its replacement - an alternator that makes no volts and a PV servo which I know works but does not on this bike

Yes I tested the motor on my sons deet and it cycles when the ignition is turned on

@SpookDog said in Hello all:

@mcludd

Have you tried running the bike with the PV side cover off to see if it works at all while running? 2004 was a new wiring generation. I don’t know if they even cycle at key-turn?…

I have run it with the servo plugged in but no cables just watching the pulley and no movement through the rev range However the earlier post which says that the later ones are very DC dependant is interesting, I know the battery is OK but I haven't checked for a 12v supply going into the CDI (principally as I dont know which wire is the supply) but I have noticed a broken red wire in the loom which could be a supply ? The wiring harness is generally not in very good shape so it could or indeed probably be the problem rather than the CDI