20 Most Recent 2003 Yamaha DT 125 R - Page 3 Questions & Answers


does it have oil filter? maybe it needs replaced.

2003 Yamaha DT... | Answered on Jul 08, 2009


Pull the heads and have the intake manifold mating surface planed.

2003 Yamaha DT... | Answered on Jul 06, 2009


the cog as you discribe it is the chain tensioner for the back wheel. look at the rear shocker and you will see 2 castlated locking nuts this is how you adjust the rear suspension,by undoing 1 of them you adjust the other then tighten the other onto it making sure they are both tight together

2003 Yamaha DT... | Answered on May 28, 2009


Assuming you are using two stroke engine oil, the pump is pumping too much into the gas. DO NOT use motor oil in the gas. If 2 stroke oil is being used, then get a new pump, fix the one you have or disconnect the pump and mix the oil with gas when you fill up. Four ounces of 2 stroke oil per gallon of gas equals the standard 32/1 fuel mix.

2003 Yamaha DT... | Answered on Apr 29, 2009


the problem arises in this situation because the water system is mixing with the oil system? if i am right in thinking that this is an liquid cooled version with the infamous powervalve system then you might find it usuially has something to do with that. if you keep running th engine then you will find out that it will do lots of damage to your piston which relies on oil to move and cool.

2003 Yamaha DT... | Answered on Feb 25, 2009


In the center of the under side of the motor/oil pan, you will see a diamond shaped plate held on by two screws/bolts and having a single wire coming out of it.

Yamaha DT 125 R... | Answered on Apr 04, 2019


Hi, Anonymous for this scenario you will need your service manual that has all fastener torque specs and a wiring diagram on the back pages, parts fiche, and owners manual if you can't find the best tool you ever bought for your Yamaha, despair not, for a mere zero $0 you can download another one.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Torque Specs
need 78 dt175 head bolt torque specs
Yamaha DT100A 1974 Service Manual includes 125
https://www.partsfish.com/page/oem-parts-for-yamaha
http://www.dt125.cz/download/Owners_Manual-DT125R.pdf

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Yamaha DT 125 R... | Answered on Apr 06, 2018


Hi, Tim for this scenario you will need your service manual that has all fastener torque specs and a wiring diagram on the back pages, parts fiche, and owners manual if you can't find the best tool you ever bought for your Yamaha, despair not, for a mere zero $0 you can download another one.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
1979 Yamaha DT125 cylinder torque specs Google Search
Torque Specs
Yamaha DT100A 1974 Service Manual
https://www.partsfish.com/page/oem-parts-for-yamaha
http://www.dt125.cz/download/Owners_Manual-DT125R.pdf

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Yamaha DT 125 R... | Answered on Mar 27, 2018


Hi, Gregorycnort for this scenario you will need your service/owners manual if you can't find the best tool you ever bought for your Yamaha, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Fork Oil Quantities
1978 yamaha dt250 enduro fork oil change
Yamaha DT100A 1974 Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-dt

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Yamaha DT 125 R... | Answered on Jun 12, 2017


Hi, Anonymous and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Fuel line to the carburetor or throttle body pinched or kinked.
8. Carburetor float stuck.
9. Fuel injectors clogged.
10. Severely discharged or damaged battery you need 12.5 volts or better and be able to pass a load test if necessary.
11. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
12. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and CDI box.
Spark plug cables in bad condition and shorting check for leakage in the dark, cable connections loose, or connected to the wrong cylinders.
13. Ignition timing incorrect due to a faulty MAP, CKP, O2, TPS, sensors.
14. Faulty neutral, clutch lever, or kickstand safety switch.
15. Faulty fuel pump or fuse or relay.
16. Faulty CDI box.
17. A stuck bent or burnt valve.
18. Tip over sensor needs a reset.
19. Check for engine trouble codes.
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.
http://www.thumpertalk.com/topic/824422-dt175-will-not-start
https://yamahaclub.com/forums/topic/27070-79-dt175-mistery-wont-run
Yamaha DT100A 1974 Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-dt

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Yamaha DT 125 R... | Answered on Feb 01, 2017


Hi, Anonymous for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere zero $ you can download another one. 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.
https://yamahaclub.com/forums/topic/28097-yamaha-dt-125-sm-2007-starter-motor
Yamaha DT 125 RE electric starter removal
Yamaha DT125RE 2005 Service Manual
OEM parts for Yamaha
YAMAHA DT125R Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Yamaha DT 125 R... | Answered on Jan 16, 2017


Hi, Anonymous what you need is a wiring diagram that you can find in the back of your service/owners manual if you can not find the first and best tool you ever bought for your bike, despair not, I have found one for you that costs $15 dollars. 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.
WIRING DIAGRAM thread for all sorts of bikes
Yamaha Motorcycle Wiring Diagrams
DOWNLOAD Yamaha DT100 DT 100 74 83 Service Repair Workshop Manual Download...
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-dt

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Yamaha DT 125 R... | Answered on Dec 19, 2016


Hi, Dennis it should be noted that in order to "PROPERLY" diagnosis any electric starter issue it is "IMPERATIVE" that you begin with a fully charged battery 12.5 volts or better and be able to pass a proper load test, and the usual suspects are:
1. Battery terminals have loose or corroded connections.
2. Battery cables faulty due corroded or broken internal wiring at the cable connector especially the "NEGATIVE" cable which needs to be checked at "BOTH" ends.
3. Battery voltage, must be 12.5 volts or better, voltage from the battery to the main circuit breaker to the ignition switch to the security/ignition fuse to the TSM/TSSM module to the engine stop/run switch to the starter button to the starter relay to the green wire that connects to the starter solenoid can not drop more than 1/2 volt of battery voltage.
4. With a voltmeter connected to the battery, the ignition switch in the on position, the kill switch in the run position, the starter button depressed, starter engagement should not bring voltage below 8-9 volts.
If a lower voltage is produced a proper battery load test should be performed with a load tester to validate battery integrity or battery replacement.
5. Faulty starter relay, check continuity.
6. Faulty starter solenoid, check contact plate and shoes for excessive electrical erosion/etching, refurbish as necessary or invert contact plate and use the virgin backside. Check contact shoes for being loose. Replace solenoid if the negative function is still a final outcome.
7. Faulty starter, bench test starter with a 12-volt battery if negative function check, decontaminate and undercut armature commutator segments as necessary, check segments with an ohmmeter probe each one and the segment next to it for shorts. Have the armature tested with a growler and field coils, and brush plate with an ohm-meter for opens, shorts or grounds. Replace brushes if less than .438" It is generally cheaper to overhaul/refurbish a starter motor than buy a new one.
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.
https://yamahaclub.com/forums/topic/24325-dt125x-sm-solenoid-clicks-and-no-turns-over
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
http://www.dt125.cz/download/Owners_Manual-DT125R.pdf

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Yamaha DT 125 R... | Answered on Oct 18, 2016


Hi, Anonymous for this scenario you will need your service/owners manual if 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 click on the links below. Good luck and have a nice day.
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
OEM parts for Yamaha
YAMAHA DT125R Owner Manual

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Yamaha DT 125 R... | Answered on Sep 01, 2016


Hi, Anonymous for this scenario you will need your service/owners manual if 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 click on the links below. Good luck and have a nice day.
Gearbox Oil for DT 125
Motorcycle Message Board Motorcycle USA
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

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Yamaha DT 125 R... | Answered on Jun 16, 2016


Hi, Jaymears1980 your speedometer needs the data from the reed switch in order to function properly 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.
https://yamahaclub.com/forums/topic/35409-speedo-not-working How to FIX For Scooter Speedometer and odometer Stopped Not Working
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

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e


Yamaha DT 125 R... | Answered on Mar 14, 2016


Hi, Nick_krywiuk 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.
https://yamahaclub.com/forums/topic/31400-sputter-sputter
Kawasaki ER 5 POWER LOSS
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

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Yamaha DT 125 R... | Answered on Mar 14, 2016

Not finding what you are looking for?
2003 Yamaha DT 125 R Logo

48 questions posted

Ask a Question

Usually answered in minutes!

Popular Products

Top Yamaha Experts

vince

Level 3 Expert

1234 Answers

Steve Sweetleaf
Steve Sweetleaf

Level 3 Expert

1176 Answers

Israel Pineiro Jr

Level 2 Expert

165 Answers

Are you a Yamaha Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

View Most Popular

DT 125 R Yamaha

  • DT 125 R Yamaha

Most Popular Question

ive recantly replaced pistons rings

  • Motorcycles
Loading...