DT125R FORUM

I really liked this pipe on my DTRE.

Here's one for your year.

https://www.dirtbikexpress.co.uk/products/dep-2-stroke-nickel-front-pipe-yamaha-dt?variation=283926

You don't need to modify the cases to run the Athena 170 kit. Not sure where you've gotten that from.

The 3BN is the restricted head, 3MB is the non-restrictive head.

You don't really need to faff about with dialing in the Zeel as it comes with 5 maps that they've tuned. Of course to maximise the performance then yeah, you need to dial it in. But it was one of the single most performance increases I noticed.

You can go one step further and fit the entire VForce4 Reed Block assembly.
https://dt125r.co.uk/topic/2914/vforce4-reed-block-upgrade-yamaha-dt125r-re-x

Zeeltronic and Exhaust made the biggest changes to me.

I never got on with the port tuning if I'm honest.

And the one thing I've grown to appreciate is the Athena Big Bore kit. It took a long time to appreciate it, but when you accept the DTR isn't an RS 125, then having the extra CCs and drop in overrev, actually suits the DTR nicely.

That's normal. All DTs are like that.

@mbmO8 yeah I hear it. Obviously it's hard to identify it on a video.

But often the powevalve can come loose and that might be a sign of it. Whip the right hand side off and have a look to see if the bolt has come loose.

It sounds sweet!

It's not the powervalve end cap is it?

@HOTSHOT-III Hopefully the issue gets resolved as I don't want to lose the data they're hosting.

The important stuff I ought to host here to guarantee it isn't lost.

See the recent news that imaging hosting site Imgur has been revoked access from within the UK.

This is incredibly frustrating as my builds and tutorials are now blocked access there.

To access any material on Imgur which this forum relies on, in an attempt to migrate, a Virtual Private Network (VPN) can be utilised to circumvent this measure until the restrictions are lifted.

There are free alternatives that can be used, but Opera offers a Free VPN service built into the browser, and I have confirmed today that this works.

An alternative approach is to use another site like Flickr or GooglePhotos. I migrated to GooglePhotos a while back, but found it painful to use.

Trust me, I love my RS, but the DT is just a solid whip.

I now have an RS powered trail bike. Never ridden it, despite having it 4 years.

Only use Athena, Genuine or Vertex head gaskets. The white ones blow straight away.

My advice would be to keep your DT.

I utterly adore my RS, it's absolutely rapid.

But the DT, especially yours, is the better bike to have and enjoy. It's utterly bullet proof, which makes it all the worthwhile.

The RS is wonderful, just tempermental.

Yeah, I've never had any luck with the pattern ones.

Hi @gary76,

What condition is it in?

Is it full power or restricted.

Let's say an original, restricted model, mint condition £2500.

An original full power one £3000.

For reference, this is mine.

@kubicz Have you got a link?

Yeah it's a nightmare trying to get the torque wrench in, can help to drop the front engine mount bolt gives you a bit of wiggle room.

Just go over the bolts and make sure none of them have rattled loose again.

Often these things come from a very simple place. So just double/triple check all coolant hoses/unions etc.

Did you torque the head up in a star pattern evenly?

Did you retorque after a few heat cycles?

You're running standard barrel yes, as the Athena kits need o rings for the spark plugs.

@mbmO8 Just checking, you used a genuine/Athena/Vertex head gasket? Not a knock off. And the head gasket was installed the right way up?

I've don't think I've seen it being done. It almost sounds by which point you'd have a KTM LC2, so why not just go and buy one of those instead?

There are lots motorbike combinations from the Yamaha family which can be made to fit the DTR, so if it's upgrades you're looking for then it's worth exploring those first.

Full rebuild sounds overkill for such a low mileage.

It'll probably be something simple like gunk in the exhaust and/or intake or carb issue.

I'd get a compression tester and measure the compression the engine's outputting. Should be in the 140 range if the engine is healthy.

@daley1471 looks clean