Time to change wheels and ...

[Yegor]

Hi there ! I'm writing from Spain. I have find this forum looking for some SM wheels for my DT 125 R 2003. Do you know any website to buy them or maybe adapt ones from another bike ?

PD: Also I have to change / rebuild cylinder , and why not was looking for the famous Athena big bore. ANy experiences with this kit ? I know I will have to buy carburetor 32 and exhaust pipe for better performance. Thanks in advance. Mallorca

PD : https://www.ebay.co.uk/itm/YAMAHA-DT-Exhaust-125-Pipe-in-STAINLESS-DTX-DTR-E-Hand-made/302430128281?hash=item466a3d8899:g:2WYAAOSwMgdX1ga5

:man_mountain_biking_tone1:

[declan]

@yegor I came across a set of dtr sm wheels on the uk eBay site for around 650gbp I don’t have a link though and the Athena big bore kits are pretty good from what I hear mostly adds load of torque so you lose the high revving capabilities

[Calum]

Oh hello.

I personally wouldn't write home about the Athena kit. Would be better off getting the DTR cylinder ported and tuned rather than spending the money on the Athena kit.

Depends what you want out the bike and how far you're willing to go.

The Athena kit is a great bolt on accessory, but it is very well utilised.

As far as wheels are concerned, your only "bolt on" solution is going to be the DTX wheels.

But you're only limited to your imagination.

There's my sumo setup.

And I know others have made their own unique take on a SM setup.

[Yegor]

Thank you very much for the answers. Yes I will see what can I do with my Yamahas cylinder, maybe only buy the Wossner piston and tune some things . But wanna get that ( Enduro) exhaust from ebay.

@Calum your DT looks great , bravo. :clap_tone3:

[Calum]

@yegor So that exhaust you linked me, the guy who makes it made the one in my photo. The welding is superb!

[oldman]

I have received the exhaust for the 89 bike from the same guy, so tempted to fit to my bike, work of art!

[Yegor]

That's great ! Maybe you know if the YAMAHA XT125X 2005 Wheels
( Front: 100/80x17 - Rear :130/70x17 )

fits on Yamaha DT 125 R 2003
( Front: 80/90-21 - Rear: 110/80-18 )

? ( I mean hub dimensions )

[declan]

@yegor like Calum says anything will fit if you want it to but you could also lace the dt hubs onto sm rims

[Yegor]

@declan That's great idea .

[Yegor]

Hello ! Now I will try to explain my situation with photos ( sorry for my english )))

first, I had a problem with yamaha dt lip seals ( water pump) ( the motorcycle was stopped more than half a year) , I changed it, but after that , the next day riding my bike the rear wheel suddenly blocked. Now I disarmed the cylinder and you can see whats going on. So I cant imagine why that happens , original cylinder and piston only 10000 km. And it's almost impossible to put it wrong the water pump and seal. ( or not

• The Yamaha DT 125R cylinder is sleeved ( iron ? ) can be repaired. or go for Athena )

• Can it be the fault of the oil pump ? how to check it¿ ( the engine thermostat works well.)

• ?

Usualy I buy in Wemoto.com . Thank you in advance !

[Calum]

Embed me!

Yeah, you can bore that out no problems.

Ensure you modify the powervalve to the right spec. Otherwise you will risk having the powervalve come into contact with the piston.

[Yegor]

@Calum You mean just adjust the power valve position ? ( cables ) Thx !

[Calum]

@yegor No, you physically have the modify the powervalve after a rebore.

[Irongamer727]

@yegor Athena!

[Irongamer727]

@yegor but sort out why it seized first please

[Yegor]

@Calum thx again! do you know how to extract the power valve from the cylinder ? ( for cleaning and modify )

@Irongamer727 Ok ! )) Do you need to readjust the oil lubrication after install the Athena kit ?

Thx a lot .

[Calum]

There is a bolt that goes through the powervalve, can be unscrewed from the front right of the cylinder. Behind the powervalve cover from the clutch cover side.

[Irongamer727]

@yegor some go premix some don't. I will go with the pump when installing my kit

[Jens Eskildsen]

A slight rebore shouldn't affect the powervalve

[Calum]

@jens-eskildsen Yes it will.

If the bore is stock (getting rarer these days and not worth assuming) then no, you're right. But once you start going over the first rebore size, modifying the valve is a must.

To save confusing, I said modify the valve just as a precaution.