Question about 2004 Yamaha DT 125 R

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DT 125 R will not start

My sons DT 125 R got stolen. When we got it back the tank lock was out the ignition switch cut out and hot wired. we brought a complete lock set. new switch has power in and out of the white conector but red conector has none. i am thinking bad switch but i do not want to buy again. bike is now on salvage title and in MO everything has to work so i can not just ground the two wire because the nerutal light stays on. wiring diagram does not show which is hot. can someone help me out. thank you Last edited by aceme2 : 10-19-2008 at 08:31 PM. Reason: gramer

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  • ats jas Mar 09, 2009

    hi i have a dtr 125 1990-91 h reg it as stolen i got it back with allt he wires cut i have sorted them i have put new plug and cap on it and new battery got a reallt strong spark also put fresh petrol in it but it wont fire i kick it and kick it it build up presure then it just backfire and thats it i dont no what the hell they half done 2 it also i have 2 tilt i bike 2 the right then try and kick start it if i stand it up right and kick it it feels like it aint got any compresstion CAN ANYONE HELP PLEASE

  • dennash Mar 13, 2009

    dt 125 petrol not gettinf through wont start

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Hi try going on www.dtr125.net then clicking on the wirering diagrams,hope this helps.

Posted on Aug 08, 2009

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Look for the shorted wiring mybe the problem is in ignition switch.the red wire is from the battrey supply.

Posted on Mar 19, 2009

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Just to eliminate the most-obvious; you have checked for continuity/power through the killswitch on the right bar, and for all your fuses,yes

Posted on Nov 10, 2008

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1 Answer

What are the settings for dtre 2006 air/fuel ***** mix


Hi, Paul your air/fuel mixture ***** only manages your engine idle, if your bike died while riding that was not the problem and you should start with 1 1/4 turns backed out from bottom, the following possible trouble areas are geared mainly towards a Harley but there are many universal causes and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Air/fuel mixture ***** improperly adjusted.
10. Water or dirt in the fuel system, carburetor or filter.
11. Restricted, blocked or kinked fuel line.
12. Fuel tank empty.
13. Gas cap is not venting properly or fuel tank venting system blocked.
14. A failed fuel pump, pressure regulator and or fuel injectors.
15. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
16. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you need please click on the links below. Good luck and have a nice day.
http://www.dotheton.com/downloads/Honda_Technical.pdf
https://yamahaclub.com/forums/topic/21307-dt-125-r-cutting-out-problem
https://answers.yahoo.com/question/index?qid=20071113054107AAxEnUC
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf

Apr 02, 2016 | 2006 Yamaha DT 125 RE

1 Answer

Yamaha 125 dtr starts then cuts out on the move


Hi, Anonymous the following applies to carbureted also fuel injected models and the usual suspects are:

1. Severely discharged or a damaged battery, 9 volts or lower.

2. Failed alternator/generator and or voltage regulator.

3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.

4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.

5. Failed system and or ignition relay, check for continuity.

6. Failed ignition coil, ignition/electronic module.

7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.

8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.

9. Air/fuel mixture screw improperly adjusted.

10. Water or dirt in the fuel system, carburetor or filter.

11. Restricted, blocked or kinked fuel line.

12. Fuel tank empty.

13. Gas cap is not venting properly or fuel tank venting system blocked.

14. A failed fuel pump, pressure regulator and or fuel injectors.

15. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.

16. Needle and seat stuck closed in the float bowl.

For more information about your issue and valuable "FREE" downloads that you need please visit the websites below. Good luck and have a nice day.

DT 125 Cuts out

https://yamahaclub.com/forums/topic/35916-dtr-125-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

Oct 04, 2013 | 2004 Yamaha DT 125 R

1 Answer

My sons Buell Blast got Stolen we got it back they had cut the wires going to the ignition switch when we re cnnected it eveything works but Taillight and gauge lights have replaced the fuses any Idea


Something isn't wired right or one of the connectors somewhere has a wire pulled out in it. Check for a bad ground too. Too many things get messed with when a bike gets stolen.

Apr 11, 2013 | Buell Blast Motorcycles

1 Answer

No power on low revs, cuts outs doing a u turn and ticks over but will cut out. fine in high revs.


Hi, Anonymous the following applies to carbureted also fuel injected models and the usual suspects are:
1. Severely discharged or a damaged battery, 9 volts or lower.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Air/fuel mixture ***** improperly adjusted.
10. Water or dirt in the fuel system, carburetor or filter.
11. Restricted, blocked or kinked fuel line.
12. Fuel tank empty.
13. Gas cap is not venting properly or fuel tank venting system blocked.
14. A failed fuel pump, pressure regulator and or fuel injectors.
15. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
16. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you need please visit the websites below. Good luck and have a nice day.
https://yamahaclub.com/forums/topic/21307-dt-125-r-cutting-out-problem
YAMAHA DT 125 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

Mar 14, 2013 | Yamaha DT 125 R Motorcycles

2 Answers

My youngest son has a RM Z125 Suzuki dirt bike. We have had a hell of a time getting ti started. We consulted several resources and they all said his carb was gummed up and needed to be taken apart and...


Hi Check that the kill switch is connected to the ignition & is working OK
There may be a carbon deposit on the head which is glowing red hot thereby igniting the fuel like a diesel (without a spark) The other possibility is dieseling by over compression (at 14:1 compression petrol self ignites) but that is not very likely

May 06, 2011 | 2003 Suzuki RM 125

1 Answer

My dtr125 96 i have done top end pistone rebore starts every time runs but over heats has been stolen 6 years ago


The DT series had I believe a separate oil tank and oil injection pump.
Ensure the oil tank vent is clear, (some tanks have vent hose, others vented cap)...you need a vent to delivery oil to pump suction.
On the pump, ensure the stroke adjustment cable from the throttle is connected and rotates with throttle.

Mar 10, 2011 | 2000 Yamaha DT 125 R

2 Answers

DT125 no electrics! non starter


how about replacing the fuse by the battery it is a master fuse and thats what it sounds like
since all lights and bike runs after a bump it sounds like a master fuse problem
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Aug 04, 2009 | 2004 Yamaha DT 125 R

1 Answer

Kill switch wires DT125


could be black or green,but if it is disconected it sdhould run as the switch just earths the power

Jul 26, 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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