Question about 2003 Yamaha DT 125 R

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How to derestrict my dt 125 r - 2003 Yamaha DT 125 R

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The bike is restricted in qute a few places Ihave the same bike and have just de restricted mine im not sure what the other guy was meaning about the exhaust but he is right it is restricted if you remove the exhaust you will notice that there is a small pipe that has been welded in to restrict the amount of fumes that escapes this needs removing its held on with 3 welds i took mine ti a local car repar place they removed it for me for £20 . also check to see if your power valve servo is working mine wasnt so ive opend the case that has the pullys on it and put a screw in to hold the valve in mid way position ( i noticed a major diffrence in doing this ) also there is a small peice of rubber that you need to remove from the inlet manifold if you take the carb off and then the 4 bolds that hold the reeds in you will see a square bit of rubber cut this off to make it flush as this messes with the air fuel mixture . under the seat you will also find a snorkle just rip this off just yet another thing to mess with air intake . i have also drilled my air box but i wouldnt advise this if you use your bike in muddy areas unless you dont mind cleaning your carb all the time i would also get an irridum spark plug as it improves throttle responce

Posted on Sep 06, 2009

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Simply take off exhaust and there is a cone thingy i suggest puttin huk attached to fishy line when u grand it off so it comes out better instead of shakin the exhaust that should be all if not then a racin cdi n that will be all

(i dont own a dt 125 but my dad had one of the 50s back in the day and i have a rieju rs2 50 so i know what im on about)

Posted on Aug 31, 2009

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Posted on Jan 02, 2017

Anonymous

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SOURCE: derestricted Atlantic 125

The only way that 125's are usually restricted is through the exhaust. Theres usually some for of washer or something in there that restricts the exhaust that you can dremel out.

Posted on Nov 10, 2008

Anonymous

  • 101 Answers

SOURCE: dt 125

Hi .........
In your case I would suspect that your timing is retarded and the bike would run better/correctly if you set it to factory spec. Or maybe you have a mechanical 'advance' and it's stuck in the retarded position?
Good problem ............ let me know how you get on

Posted on Dec 29, 2008

Anonymous

  • 125 Answers

SOURCE: How can I fully derestrict a 2008 TDR 125. Bike

Hi,

I suggest to check wether the carburator has a restriction in the holder
check if the clapets (between carb and cilincer) has a restriction
check if the exhaust has a restriction.

But overall: a race-exhaust, a tecnician who personalizes the carb to the local wether conditions by adjusting the jet, an eventually needed unrestriced cdi will improve bigtime.

greetings from a big 2s fan.

Olivier.

Posted on Oct 22, 2009

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