DT125R FORUM

By the way - this seems to be the most frequented site for looking at DT200/230 bikes and parts in Greece. I am not sure, but I think it was the only market in EU where they were sold. https://www.car.gr/used-bikes/yamaha.html?category=15002&make=13329&model=16968&model=16971&model=16973&registration-from=1985&registration-to=2010 https://www.car.gr/parts/711/motorcycles.html/?category=711&condition=used&makes_ids=13329&models_ids=16968&offer_type=sale&pg=1&sort=prd

@Calum It has a 24mm round slide carburator to meet the requirements of the a1 lisence in sweden, downtuned to about 15hp, im just wondering if a TM28SS will fit, they are very hard to find.

Hi there, Pretty sure the RPMs as far as the CDI are concerned are determined by the pick-up/magneto. So when you switch the ignition on and off, the powervalve does a cleaning cycle. Once this cycle is complete and the engine is running the valve should return into its closed state. If it is not, then it's possible that the powervalve wires have been inverted and the powervalve hasn't been adjusted properly. I feintly recall this being a common problem back in the day.

@Calum so i got it together it ran well when i started it in the garage but when i went for a ride when riding it doesnt have power and doesnt rev over 7k rpm when in neutral doesnt go over 9k but powervalve is working and no weird noises from the engine im completly clueless

The DTX comes fitted with a 3MB. It's only the very early 89/88 models that came with the 3BN cylinders. Otherwise all years ran the same cylinder. Surprising there isn't more availability given how many of them were made etc

Oh wow, well you'll be pleased to know not much has changed in the last 20 years for two strokes. Port tuning is as it's always been and fuel injection came a few years ago on nothing but the most elite machines. These bikes are a doddle to get running, so throw up any questions you may have and we'll point you in the right direction.

@HOTSHOT-III Ok cheers mate for that, I’ve ordered what you recommended Cheers

Sorry for late reply Thank you We carefully took it apart and greased it back up and running nice now, the bike is so much more responsive and acceleration is a lot better

Also don't forget to change bulb in light cluster for an led Kind regards

Hi @yennie , That's cool and I am glad you've managed to get something working for your setup. I am working on something similar to just add a slight angle to the inlet manifold so pod filters don't foul the shock absorber.

They say it's mechanical but the description sounds electrical and they're adamant it's not I still maintain it's electrical related, ignition timing, static angle, etc. But I am not familiar with the ignition system they're running and/or how it's been wired together

Where is the Dyno result with power changes?

Okay, a few more NOS parts ordered and now the primary drive gear, clutch basket and generator nut all torqued to spec! [image: clutchAssembly01.jpg] All 6 TZ750 clutch springs fitted with brand new clutch plates and NOS OEM damper rings installed. I also replaced the factory pressure plate with a gorgeous billet RDLC Crazy pressure plate. [image: clutchAssembly02.jpg] It's said to have better oil flow and looks to have a fair amount machined out of it, but I was surprised to see it's slightly heavier than the factory setup. [image: clutchAssembly03.jpg] This milestone marks the completion of the bottom end There's just the matter of the water pump to install, I was really hoping to get a Chariot Performance uprated one, but they're no longer manufacturing them. And then there is a company that makes a stunning carbon fibre generator cover/chain guard. I did have my eye on a Chariot Performance one, but again they seem to no longer be making them sadly. The cylinders are booked in with Mick Abbey for some mild porting work, then the heads need to be sent off for machining. But once that's done it will mark the engine work completed for this project and I will turn my attention to the frame. The frame has now been moved into the garage and I'm just trying to figure out how/where the steering damper should be fitted!

I do need to get back out on this bike! The front brake disc failed (annoyingly as this wasn't cheap) and the battery died over winter, even though it was on trickle charge, again very annoying. I did manage to get some nice bits for this bike, but I've only manage to get around to fitting one of the parts as the bike is in a storage unit and I don't have all the tools there to do all the bits. Firstly I have this beautiful VHM gold skull cap. [image: vhmSkullCap.jpg] I look forward to getting this fitted. I also have a pair of these beautiful carbon infills for the side panels (if I can remember where I've put them). I will fit these when I do the skull cap as it requires taking the fairings off. This week a special parcel arrived from Italy, which was a beautiful carbon fibre rear seat infill to replace the FRP one I had there originally. [image: carbonRearSeat01.jpg] It almost looks plastic dipped in that photo, but I can assure you it's the real deal. [image: carbonRearSeat02.jpg] Very happy with the fit and finish (although the seat wasn't placed down properly in this photo, hence the gap). [image: carbonRearSeat03.jpg] Just buzzing to get out back on it now that summer is here! [image: carbonRearSeat04.jpg]

Forum patched and updated. Fixed some database corruption issues which was having a knock-on effect with emojis so hopefully they're working now.

@vtrtomuk Yeah, just have to enjoy it for what it is sadly. I have had mine ported and got lots of supporting mods to boot. It goes alright, but my Aprilia decimates it completely. Still nice bike to have and you can get some improvements out of it.

Hi Glenn welcome to the Forum. It's very quiet on here these days, everything migrated to Meta a long time ago, but I feel the real enthusiasts will remain here Sounds like you've got a wealth of experience with these bikes, almost feels criminal to be breaking them nowadays though, price of them are soaring.

glad you got it sorted with the round slide carb fitted now bud

Do you mean dual piston caliper? Or do you want two calipers 🤭 https://ebay.io/m/yOnXyn Or have one made using Nevs design [image: 27961158925_26ab4db984_c.jpg] https://dt125r.co.uk/topic/1343/dt125-front-brake-caliper-bracket-dimensions/2?_=1772783708212