DT125R FORUM

Hi guys had mot today
Put a brand new plug in and ripped it to mot and back got 72.1mph on gps so pretty good! But wasn’t fully pinned, got home and thought I’d Chuck the plug after a 4 mile ride
What you think?
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@SpookDog

Hi mate yes I’ve done it on this bike I’ve got now, it’s a dtre engine in a Dtr frame, it’s really simple. @Calum did a post about it and what you need! Here you go

https://dt125r.co.uk/topic/13/kick-start-conversion-dtre

Thanks to all the help offered i solved the issue it was the cables not turning the valve the right way it was closing instead of oppening , tomorrow im gonna do a topspeed test thinking of hitting atleast 120-30 kmh

I think the main thing are the piston rings bedding in.

I haven't worried about it too much. 50 miles if it's just a top end. But I am quite happy to rebuild the engine prematurely.

@89dt125nick

Drain the coolant properly before and when you take off the head take some pics. You want to see where it was leaking from the coolant jacket into the bore. Also look for the root cause, head gaskets don’t usually blow unless there are overheating issues, or (in my case) misfire problems…

Buy a price of plate glass10mm x 30cm x30cm to lap the head clean and smooth…

Don’t buy a shitty head gasket, get an Athena, Vertex or genuine head gasket…

Part 1 on the first link and an o ring needed. Joint 10v-12446-00
Thanks mate

What a beast!

If you got the dough....why not.

@DTR-NSR

Yep, I’m definitely leaning towards the 3bond

Hi guys I’ve got a 3BP bottom end, does anyone know what year it is and what crank stroke does it have? As want to run a 3MB barrel thanks!

Old thread alert, but! My servo was doing this when I used inferior 2stroke oil and the power valve was gummed up and sticky. As soon as I cleaned of the varnish/gumpf it operated sweet and smooth…

Did you get anywhere with the bigger single radiator?

@SpookDog Probably get a better response on the FaceAche forums.

Lanze airbox snorkel gotta try and find also suppose be a nice mod

@SpookDog sorry for late reply all in with post was around £20 I think

4bbcebcb-80d6-4e56-adcf-f0221c831cfc-image.png .....Yz is totally different kick start to DTR gear shift is the same

Just make sure that it’s in there nice and squarely. Also that the ‘insert’ has a good clean finish with no bad grooves or crud buildup on it 🙂
Did you split and rebuild the cases or just replace the seals? (both)...
Just use a proper clutch holder to tighten (or loosen) the clutch centre nut, don’t stick a screwdriver in the outer basket ‘fingers’! The alloy snaps so easy and without warning!...

@MadGyver I have the 3BN head on a 16.9 KW bike

I know it’s an old thread, but: It’s the barrel that gets grooved, not the head (I thought it was head as well) and it is £35 @ PJME according to the email they sent me 👍

@Calum always amazes me how much difference a carb can make to a bike, I always remember my old dt50r when I upgraded the exhaust from standard to performance how untuned the carb was to the exhaust, turned a nippy machine into an sluggish horrible mess