DT125R FORUM

@calum other thing is when the bike was running the power valve didn’t move it’s not coked up or stiff as the top end and cables are all brand new just wondering if there’s anyway to find out if the cdi is goosed how can I check the signal from the cdi unit?

Right need some help please

Is there any way to find out if the 3rm-20 Cdi unit is okay?

the problem im having

Turn the bike on the power valve will turn to normal position but it dose not do the forward backwards cleaning cycle/movement when it turns on. It's the 5 wire power valve 2 wires go to the internal motor (black and red) (black and brown) and 3 wires (yellow and blue) (white and black) (white and red) go to the veriable risistor inside the power valve which is 7.5k ohms resistor

dose anybody know what the voltages out of the cdi unit should be while the bikes ignition is on for the powervalve side

any help greatly appriciated

@Calum Il copy and paste it into the forsale section but id like to leave it in here too as all the pics etc... are in here

Soo i have come to a very hard decision and have somthink i need to say and i would like everyone that see's this to have a read

All of the above parts (forks, engine, carb, frame, wiring loom + other bits that are not on here,are going up for sale) any questions please ask

all stuff for sale (Buyer sorts courier or Collection)

Engine + Carb + Wiring loom Will be soild as one unit Open to Decent offers around £650

Engine (Fully rebuilt check the above posts out)
Carb PWK32 Keihin (Brand new never used)
Wiring loom + 3RM-20 CDI + PV servo (Wiring loom Needs a little work, no ignition switch, no indicator wiring as the loom was made bare for green laning less stuff togo wrong when out and off roading)

WR426F + aliminium adapter + New head set bearings dust sheilds and shims (No wheel or caliper or Disc) (also see posts above) (£160 OVNO)

WR 200 Swingarm + Caliper and Carrier £115 OVNO (Can get photos by Request) Open to offers

Frame + tank + Rad as it is Needs sand blasting and powder coating in buyers color choice, the frame has had nuts welded onto the original nuts where the original ones stripped out and has had the rear brake master cylinder mount reinforced with 4mm steel welded on Comes with V5 also has a WR125 Rad with rubber vibration mounts fitted and Red fan will need wiring up to the bike fitted to the standard rad mount tank still fits on with the plastics extra pipe fittings on the rad may need blanking off (Price will be how ever much the powder coating costs + £200) can get photos by request

Other bits i have are two rims front and rear they need blasting and powder coating no hubs no spokes i have New bearings for the DTR hubs can get photos by request... Open to offers

cant name all the parts i have off hand but if you want to know if i have a part ask and i will see if i have the parts

@theportingmaster said in 2003 Yamaha Dt125R Project:

K38 slow jet

cheers buddy, il be getting a limited edition stainless steel and silencer exhaust from portugal in the next few months, will upload photos when its arrived!

@jonne123 there,s a few topics on this site already buddy try reading through them, this is for posting about my progress on my project

https://dt125r.co.uk/topic/790/recommended-reeds

@theportingmaster cheersa for your post mate ill have to stick with the PWK32 or now as it was a crimbo prezzie, what jet size did you use on the pwk on the 2003 dt? would be good to know. cheers buddy!

hello and welcome

heres some photos all shiney and new

well guys for chrismas i got a PKW 32 keihin carb off my old man Looks mint he said its good for a 125cc upto a tuned 200cc will upload photos later on.

yeah happy christmas @Calum Hope you have a good one and thanks for all the help and info this year! Merry Christmas and a happy new year!!

@dtre94

hiya buddy sorry to hear about your problems, where abouts are you in the world? i work in a garage in the northwest and i could fix this for you if you nearby... let me know

Id also go with the head gasket, happened many times with me until i skimmed my head with a glass mirror and wet n dry sand paper

@Darty cheers, il have to edit it to fit my carb "When i get it"

@claws Nice where did you get those rims? iv been looking every were for a set

@claws get some photos of you bike up?

Project Update!!

Soo i have had to Design a HeadSet Spacer for my new forks to fit, as the new taper bearing for the old forks dosnt fit the steering shaft on my new forks so i have designed this using Onshape, I have Ordered some Alliminium Tube which is 56mmOD 32mmID 12mmWall 200mm in lenth for £15 next thing todo is 3Dprint a Prototype then test fit then get my freind's Lathe going and make one out of the Alliminium

A Big Thanks to @Challenger For Selling me the WR200 Swing arm, Caliper Carrier And Caliper

(This Bike Gunna Be A Beast!!!)

@NINJA cheers mate

@Darty Would you be kind enough to send me the STL file for the intake manifold so i can 3d print this on my printer please buddy?