DT125R FORUM

No pics yet been busy though got a new motor for it managed to get it all in and running but got a strange problem ive put an orig air box on it and it wont idle I have to turn the air screw all the way in otherwise it takes a little time to down rev but then if I turn the screw to the 1 5/8s its supposed to be at or any where from seated its bogs out when you rev and has erratic idle takes ages to settle and cant decide what it wants to do even with 4 or 5 screws of the idle screw in out out it doesnt make much difference to idle speed.

So I am a bit stumped other than changing the coil pack and cdi as it went through plugs before and is now still doing something similar was fine on an 8 then it decided it didnt like that plug stalled and refused to start then did the same with another 8 I found a 7 and it starts and goes like stink when riding did 30mph up my steep hill testing it but its got that idle prob.

So i'm going to get some new plugs try and get funds for a coil and cdi maybe a new regulator as the voltage its a lil strange charges about 13.3 on idle to start off then after a few mins only sits at around 12.5 unless you rev crap out of it it will then go to 14.4

All fun and games any ideas welcome for me to test next time I get out to it would be appreciated. Trying to be careful and cycle it with the new piston so it beds in ok already got a strange rattle not sure if its just a bad bore settling in or a loose bit of old piston ring dancing around the crank but its whats going on with me and this lil ped for now thought ide send a quick update n ask a few questions from you seasoned vets.

Frame looks same bottom end on tht looks like the dtr engine I have my 4hw has no cover over the oil pump and has some kind of make shift bracket for the oil cable. Looks like they chopped my frame and put a heavy duty swingarm on for that 4DL raised the coolant tank and put bat under the seat. Thats why I asked cause surely the 4 wires from the engine are the same or do I have to change the flywheel coil bit of forget its name now. I think i'll give it a bash as I got to remove the engine anyway if the mountings are the same and it wires up maybe I can put a DT rear sprocket on.

Food for thought ive got to get the energy to get at it first i'll look over that cdi wiring diagrams thing you shared and go from there just hope the exhaust mounts dont throw it out of whack.

I'm hands on so once got all the parts in sight i'll hopefully make sense of it all feel free to leave suggestions etc like I said before wish I had someone here to help me out going to be fun though so hopefully will give me more incentive.

You know thats not a bad idea i made up some gaskets that held and some stuff for a workbench and some pc feet that still hold up cant remember the name of tht printing material but had a nice spongy bounce wonder how well it would take up with the seasons though outside. What came to mind was one of them old girvin flex stem elastimers we used to have in the 90s on our mtbs but bet you cant source them either nowadays just hoping I dont ruin the bushes n stuff when I remove it still in two minds to do the front tyre and get tht mot n prey he dont notice it not as if im going to be doing jumps off road on it now theres nowhere left to ride round here. You got me thinking now though if I can stretch the spring enough and tht printing stuff holds enough for me to slip a rubber printed collar around the shaft happy days.

Your more than welcome to come and help me though bro just been reading them blog posts about couple of them builds tht RS n Yamito you got some mad skills n patience would love to restore one of mine and rebuild the engines properly i'm to impatient to rebuild the cvt on her moped lol

Thanks lads appreciate tht will see what I can do with all my old parts hopefully get this old girl growling like she should

Also got me thinking about that high mileage bike you had maybe it had a slightly diff sprocket setup or something or just a blessed engine my current one pulls so nice with a larger front sprocket I took the Keeway out for a test drive today and man its slow af compared to my DT rid it like a 2t lol trying to get it warmed up but rekon it only hit 40 max on my street my DT would happily hit 60 here hehe can't wait to get her mot'd but really itching to get the TZR running right and having a proper go of her before I decide to keep or part with her do really want the hat trick with a 90s TDR as well though a French import like you had would be the icing tbh