Here is my 2003 DT

Vforce 4 from a Yamaha blaster quad fit, just need to move the holes slightly inwards as in pictures 2 &3 but they do make a big difference.

Just do the following.

Need proof of date of manufacturer so german V5 equivalent registration document is ok. Also you should have a NOVA reference number, so DVLA can recognise it on their system if needed. This proves payed any applicable importation taxes.

MOT: The motorcycle will need to be MOT’d before registering. Any motorcycle MOT centre can do this for you. Of course you have no registration plate at this point. So they will MOT the motorcycle and put just the frame number on the MOT. Cost is the same as a normal MOT, so don’t let them charge you anymore for this service.

Road Tax: When you make the registration application to DVLA. You will need to tax the vehicle. Details of this are on the DVLA V55/5 form. Cost depends on the motorcycle’s cc.

Application of UK Registration: You will need a V55/5 form from DVLA. You can order one online from DVLA and they will even send you a guide of how to fill it out with it. Then you send this form with the £55 registration fee and all the other paperwork requested. (MOT, Logbook or Dating Certificate, evidence of your UK home address, etc)

Then you are done. Normally takes DVLA 2-3 weeks to send you a UK V5 logbook with the motorcycles registration number.

https://www.facebook.com/TeamBARacing/videos/971116419733611/

@Louis-James do love your DT mate wish mine was half as nice as yours.

If you get head machined flat you can get away with using a single O ring, any machine shop will cut an O ring groove cheap and use a yz O ring.

Bought these 100/90w Super White Xenon https://www.ebay.co.uk/itm/2x-HB12-410-P45T-100-90w-Super-White-Xenon-Headlight-Bulbs-12v/191434589033
Didn,t really make much difference so changed my battery to a 50amp 4S Lipo pack
from a radio controlled car and half the size of DT battery. Although rated as 14.8volt fully charged they are 16.8 volts so added a resistor and a diode to make 12.8volt.
Then got a 12volt relay used for car spotlamps etc and ran live from battery to relay
with a 25amp inline fuse, now my original live for the high and low beam are just trigger wires for the relay.
So when switched on now the bulb gets it's power direct from my 50amp Lipo pack and now my headlight is insane and stood in front of bike now can't look direct at the light as way too bright. Also now no longer have to start the bike to run headlight and can sit forever with headlight on now just turning on my ignition due to the 50amp hard case Lipo pack and lights unlit roads so bright and the beam can go miles now and shines brighter and further than my car spotlamps.

Wossner do a forged piston kit for the dt 125 that is 61mm and the absolute maximum can bore a dt barrel to. Gives around 146cc. https://www.ebay.co.uk/itm/Wossner-Piston-Kit-KTM-LC2-1991-2006-Yamaha-DT125-Over-Bore-61mm/371410153446?hash=item5679c52fe6:g:YI8AAOSwHnFVyn8J

Best option is to get your standard 125 barrel re-sleeved to 66mm then fit a Wiseco Forged Yamaha BLASTER YFS 200 Piston Kit 66mm. Piston gudgeon pin and small end bearing same size as dt 125, you will also need your head machining to suit. Kpm or Pjme will re-sleeve the barrel to 66mm and machine the head to match and also works out including forged piston kit and work to barrel and head less than half the price of the Athena kit. Also having a steel liner gives you the option of several rebores. https://www.ebay.com/itm/Wiseco-Yamaha-BLASTER-YFS-200-Piston-Kit-Top-End-Bearing-66mm-Std-Bore-1988-06-/173027889008?fits=Make%3AYamaha

@Louis-James hi yes was aware of that so going to use some steel rod the same diameter as the shaft and and drill and tap to 11mm thread. Then cut the keyway in to match the shaft.

@NINJA it's raining where I am or would do a video, I do have a spare relay and batteries etc so will wire together when I've had my tea and turn my kitchen light out and switch on, so bright can't look directly at the bulb or just see a black spot for ages everywhere you look.

No thats how every 2 srtoke silencer has always been made apart from most are welded up.

@declan using glue is the last thing you want on an O-ring just a bit of silicone grease, but having a poorly machined groove the O-ring sits in probably doesn't help.
Yamaha use an O-ring on there best 125 cylinders the SP although don't actualy make that cylinder themselves.

2 stroke silencers are the simplest design of any silencer known to man, there is just a tube running straight through with lots of holes. If you could be bothered just drill every hole 1mm larger than they are and the best sound absorbing material is fibreglass loft insulation cut to the length of the perforated tube then roll tightly around to thickness of silencer. As you can see I went the complete opposite.lol

Bought these 100/90w Super White Xenon https://www.ebay.co.uk/itm/2x-HB12-410-P45T-100-90w-Super-White-Xenon-Headlight-Bulbs-12v/191434589033
Didn,t really make much difference so changed my battery to a 50amp 4S Lipo pack
from a radio controlled car and half the size of DT battery. Although rated as 14.8volt fully charged they are 16.8 volts so added a resistor and a diode to make 12.8volt.
Then got a 12volt relay used for car spotlamps etc and ran live from battery to relay
with a 25amp inline fuse, now my original live for the high and low beam are just trigger wires for the relay.
So when switched on now the bulb gets it's power direct from my 50amp Lipo pack and now my headlight is insane and stood in front of bike now can't look direct at the light as way too bright. Also now no longer have to start the bike to run headlight and can sit forever with headlight on now just turning on my ignition due to the 50amp hard case Lipo pack and lights unlit roads so bright and the beam can go miles now and shines brighter and further than my car spotlamps.

@declan what silencer is it, just shortened my Gianelli silencer and then blocked half of the inside to make mine louder as too quiet.

Cost £30 to cut the groove from a machine shop in Southbank

Hi @Bluestoesonnose £85 posted ?

The O-ring conversion on a DT 125 using a 90,s YZ 125 O-ring , the tighter squish and less combustion volume really helped. On average I would say this mod gives around 1,0 a 1,5 HP. This will lower the squish from +/-1.35 to a +/-0.95mm

Hi, photos of the 4FU barrel with powervalve fitted, you can see the bore is scored
so will need replating or reboring. Just make me an offer if any good to you.