Question about Yamaha DT 125 RE Motorcycles

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My dt 125 RE won't start sometimes but i have replaced the battery, spark plug and cap

I have a yamaha DT RE 125, sometimes the bike will start by using the electric start as it has no kick start. But other times it won't start there seems to be loads of life in it but will not fire, i have replaced the battery, spark plug and the cap but its making no difference. If i put the bike into 2nd gear and bump start, it will then fire straight away. can anyone possibly help me thanks

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  • Yamaha Master
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Not energy in the battery to run both the starter and the ignition system
have the battery load tested and have the circuit checked for excessive resistance readings in the ignition system

Posted on Aug 02, 2017

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 7 Answers

SOURCE: DT 125 X Backfiring??

This may not apply to your bike but a lot of the smaller engine 2strokes can still run but backfire if they have one broken reed valve.

Posted on Jan 17, 2009

sardanadixit
  • 813 Answers

SOURCE: yamaha DT 125 2003 Main beam headlight keeps

check the wiring, make sure that you are using the bulb with the correct rating. Also get the output in the headlight connector checked.

Posted on May 12, 2009

MakisRC51
  • 408 Answers

SOURCE: Yamaha dt 175, voltage question. When idling, my

You need new regulator and new battery.The battery works as a filter as well.If it is in bad condition it does not filter anything and in high rpm the current is very high.

Posted on Jun 09, 2009

  • 10 Answers

SOURCE: need wiring diagram for a yamaha dt 125 water

try here

http://sites.google.com/site/motorcyclemanualstore/

email as i did and i got what i wanted. site still under construction though

Posted on Aug 09, 2009

  • 5 Answers

SOURCE: can you put a dt 50 rear wheel on a dt 125

IF THE SPINDLE/AXLE ARE OF THE SAME SIZE,BRAKES INTER CHANGEABLE ETC THEN YES

Posted on Aug 27, 2009

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Nov 29, 2015 | Yamaha Motorcycles

1 Answer

Yamaha dt 125r starter problem


Hi, Anonymous sorry you can't find the first and best tool you ever bought for your Yamaha despair, not for a mere $0 you can download another one. 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.
Yamaha DT 125 won start
https://yamahaclub.com/forums/topic/35797-dt-125-x-06-starting-problem
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

Dec 27, 2013 | Yamaha DT 125 R Motorcycles

1 Answer

Intermittent spark when cranking dt 125 2006


if batteries ok then its bad connection, check all connections battery solenoid, starter and earth to frame

Feb 22, 2013 | 2006 Yamaha DT 125 RE

1 Answer

125 DT Yamaha won't rev up in higher RPM


Hi, Anonymous and the usual suspects are:
1. Severely drained or faulty battery.
2. Faulty regulator/rectifier or high output coil.
3. Faulty power valve, solenoid or installation.
4. Clogged air filter or exhaust.
5. Cracked or incorrect float level.
6. Float needle is not seating.
7. Faulty reed valve.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
dt175 won rev above 7k Yamaha 2 Stroke
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http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
YAMAHA DT125R Owner Manual

May 28, 2012 | 2000 Yamaha DT 125 R

1 Answer

My yamaha dt 125 won't start I cleaned the carbs


try your reeds they might be fouled they are vary easy to fix just gotta take your carb off to get to them

Feb 27, 2012 | 2000 Yamaha DT 125 R

2 Answers

DT 200 wiring diagram


search ' Yamaha DT 200 PDF' on goggle you will get a service manual with W D in seconds i did but cant post the location it wont show.

Jan 28, 2012 | 2000 Yamaha DT 125 R

1 Answer

Dt 125 2001 starts and runs ok on tick over take it out for a run after about 1 min it cuts out leave for 5to10 mins and it will start again changed coil pack and spark plug cap and spark plug stripped and...


make sure bike is not overheatin!-carb may need overhaul-u disasemble n put in solvent-or mite just need jets worked-either way a manual bought or in library is paramount

Jan 22, 2010 | 2000 Yamaha DT 125 R

1 Answer

I have a dt 125 field bike will not kick start


try squirting some fuel on the inlet and see if it firse get back to me with results

Oct 11, 2009 | 2000 Yamaha DT 125 R

1 Answer

Yamaha dt 175, voltage question. When idling, my DT measures 7 volts across the battery terminals. When revved it jumps up to over 13 volts. This is a six volt bike. I know the battery is completely shot....


You need new regulator and new battery.The battery works as a filter as well.If it is in bad condition it does not filter anything and in high rpm the current is very high.

Jun 08, 2009 | 2006 Yamaha DT 125 X

2 Answers

DT 125 2000 Very poor starter. Stolen recovered so no ignition


had exactly the same prob with my dt 125.

In the fuel tank there were two filters that had become a little blocked with small fragments. I replaced both of these, aswell as the petrol tank and now works perfectly.Worth replacing with every service.

Also make sure the amount of fuel to oil is correct because if there is too much oil it leaves a small layer of oil on the spark plug which gets thicker when the engine cools. When you dip the spark plug in petrol and put it back in it obviosly makes a large enough spark to remove the oil, but repeats itself when the bike cools.

Hope this helps

Andrew

Apr 15, 2009 | 2000 Yamaha DT 125 R

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