Question about 2001 Yamaha DT 125 R

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DT125R losing power.

My DTR is losing power in 6th gear, about 7 to 8000 revs, going about 50/55, it wont go any faster, it will only go to 7 to 8000 revs, no further. it's only started happining within the last few weeks,its like somethings blocking it in some way,changed the plug, air filter, full service really but still the same.

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  • 375 Answers

Check for blockages in your exhaust.

Posted on Jun 29, 2009

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My 95 ninja zx600e has been jetted and it will not rev passed 6k when first started and will not go passed 75mph in 6th gear but no problem going faster in lower gears. Any ideas?


First think safety w speed..ur on twowheels. Jetting a carb is touchy..leave it to xperiencd pros. Too lean an engine w fry it

Jul 17, 2015 | Motorcycles

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Dtr 125 water pump diagram


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.
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http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
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Apr 13, 2013 | 2005 Yamaha DT 125 X

1 Answer

My dtr gets hot easly


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.
yamaha dt 125 engine problem plz help
Overheating Dt125R
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
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Oct 06, 2012 | 2003 Yamaha DT 125 R

1 Answer

Hello, I have a Yamaha Dt125R, my bike is really sluggish and it splutters when I pull off, and 4th,5th and 6th gear have no power what so ever, if I manage to get into 4th gear, I have to shift down to...


Hi, Ryantanner20 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 blue links below. Good luck and have a wonderful day.
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HELP Yamaha DT125R seems to be tad slow
Yamaha DT125RE 2005 Service Manual
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http://mybikemanuals.com/yamaha/yamaha-dt

Jan 19, 2012 | 2005 Yamaha DT 125 RE

1 Answer

The rev counter on my dt 125 has suddenly stopped working, does anyone know what could have aused this???? :S


Hi, Magicaltrevo the answer to this question is way above my pay grade for this situation, I would call or visit my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry.
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.
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Jan 11, 2011 | Yamaha DT 360 Motorcycles

1 Answer

Loses power in 6th gear


Not much to go on here. Power loss in a high gear would likely be attributed to carburetor. No bike, no year, no info, little tough to help you. The throttle would likely be fairly wide open in 6th gear where the bike would have the least power and would be calling for gas and probably not getting enough- or possible to little/too much air. Either way if runs in lower gears it isn't likely to be plugs or ignition, timing, valves or other obvious mechanical stuff.


Sep 02, 2009 | 2001 MZ RT 125

1 Answer

Car drops out of gear, stars with 6th lets you


Most probably you need to check the clutch

Jun 28, 2009 | Smart fortwo Cars & Trucks

1 Answer

Losing power in last gear


If all other gears are doing okay then I would check with your local dealers parts department and ask the number of teeth on the counter sprocket and on the rear sprocket on a stock dtr 250. The prior owner may have mounted a larger counter sprocket and / or a smaller rear sprocket on the bike. The drive ratio may be out of range such that the engine is trying to make for a really high top speed but just doesn't have the strength to do it.

Please rate this solution. Thanks.

Mar 18, 2009 | 2005 Yamaha DT 125 X

1 Answer

No power and high fuel consumption


Suspect worn needle valve & seat assembly !---Quick test , with care>Whilst riding on open road &holding throttle at set position, switch off fuel supply & note IF engine speeds up, IMMEDIATELY Back off throttle, watch rear vision mirrors for traffic behind & switch on fuel supply!---If that small test indicates Carburettor area of further examination, UNLESS YOU ARE QUALIFIED the needle valves need to be examined byTrained eye!-(Especially wear on sides of needle valve & ALSO, check "floats"Stay Upright Des

Jan 08, 2009 | 1993 kawasaki ZZR 400

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