Question about 2000 Yamaha DT 125 R

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How do i de-restrict my 03 DT125R - 2000 Yamaha DT 125 R

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This method only works on pre1996 models,after that the restrictions became more involved than a washer tak welded into the exhaust port. after 1996 the bike is restricted in 3 main areas. 1.the exhaust now has 2 half moon shaped plates inside the expansion chamber(you will need to cut the front pipe open to remove these, then weld it shut) 2.the c.d.i is now set to ****** the power after 7k revs. source a pre1996 c.d.i. 3.the power valve, this is on a servo that controls its postion at a given point in the rev range,this is desinged to give a smooth power delivery and better fuel econemy. disconect pully cables from power valve rotate 180degrees lock into position,your power valve is now locked open. you will notice she sounds different,also a destinct lack of power until about6/7k revs. where she'll shoot off like a rocket as the power band kicks in. IF YOU ARE USING YOUR BIKE ON ROAD PLEASE DO NOT LOCK THE POWER VALVE. IT CAN BE A LOT OF FUN IN A FIELD SOMWHERE BUT YOU WONT BE LAUGHING WHEN THE BACK END SPINS UP ON A BUSY ROUNDABOUT. i do recomend re-jetting the main jet in the carb when de-restricting. go up 1 size i think i used a 260main jet. thats it, have fun but be carefull.

Posted on Dec 18, 2011

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Hi remove the front down pipe take out the washer that restricts the hole will invole drillng or grinding

cheers jay

Posted on Jun 24, 2009

  • 1 more comment 
  • jason burgess
    jason burgess Jun 24, 2009

    hi remove the front down pipe take out the washer that restricts the hole will invole drillng or grinding



    cheers jay

  • jason burgess
    jason burgess Jun 24, 2009

    hi remove the front down pipe take out the washer that restricts the hole will invole drillng or grinding



    cheers jay

  • jason burgess
    jason burgess Jun 24, 2009

    hi remove the front down pipe take out the washer that restricts the hole will invole drillng or grinding



    cheers jay

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Ive got a yamaha dt 125r 2003 and in want to know how you can get it to rev freeley ?


Search web for "De Restricting my DT125R" there are several sites. Caution when doing this as over revving the motor can have disastrous results. An use only the best lubes and high octane fuels.

I De Restricted my 1981 YZ125 an she still Runs today.

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Cdi diagram


Hi, Anonymous for more information about your question and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
Wiring Diagram
DT125R Wiring Diagram 98 03 model
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf

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1 Answer

Remove restrictor carbs hyo


Hi, Anonymous for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. If necessary, transport your bike to the dealer or shop and have a professional technician take it for a test drive, if it is in running condition, and give you a written estimate of repairs and answer any specific questions you may have about your problem. For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.
Derestricting the Yamaha DT125R 1988 through to 2007
How to Derestrict Yamaha DT 125 RE
DT 125 de restricting
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf

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1 Answer

Yamaha dt125r sm keeps overheating and cutting the engine off


Hi, Anonymous and the usual suspects are:
1. Low coolant level.
2. Restricted radiator air flow.
3. Faulty thermostat.
4. Coolant pump or fans inoperative.
5. Vent hose crimped.
6. Air in the coolant.
For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
DT 125 overheating
https://yamahaclub.com/forums/topic/19089-dt125r-overheating-and-coolant-problems
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf

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WHAT DO I NEED TO MAKE MY DT125 FAST?


if it seems to be running fine, its probably about as good as its gonna get. the 125 just isn't a power house. you might be able to gain a little bit of extra power through add ons like exhaust, rejetting the carb, etc.

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2 Answers

My back light and indicators have just gone , but my headlamp is ok, dt125r 03 any ideas


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Jan 06, 2010 | 2004 Yamaha DT 125 R

1 Answer

TS125r power


According to my experience if you bike has a power valve and slows down as soon as you pass 60 then you will need to disconnect it from the speedo..What I mean is inside the speedo if you remove it you will see something like a fuse which needs to be carefully disconnected.I am telling this based on my experience with a dt125r

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