Question about 2003 Yamaha DT 125 R

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How do you set up a DT125R power valve ? 2003 model.big flat spot above 5000 rpm is it the power valve or something else

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Hi, Bollard261 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.
Power Valves
Setting up the PowerValve
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Posted on Mar 14, 2016


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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: my 2000 650 dakar has 5000 miles with regular

the only way to fix the problem would be to upgrade your endcan or or is a problem with all 650 dakers.just needs tunning up.hope this helps

Posted on Sep 25, 2009

  • 6966 Answers

SOURCE: aprilia af1 125 sintesi, carb settings, what are

Hi and welcome to FixYa,

Jet size would depend which carb is installed, a Dellorto 34mm?

Initially, check the sparkplug tip colors. If very light brown to almost whitish, then lean mix; too much air, too little gas. Try raising the needle if if has notches and moving the e-clip. If fixed, use small thin washers. The basic idea is to make the needle rise early on throttle movement.

If an aftermarket open breather air filter is installed, then it would be causing the lean mix, too much air. Restrict the filter by adding temporarily upholstery foam to experiment at which thickness the flatspot would disappear.

Good luck and thank you for asking FixYa. Happy Holidays.

Posted on Dec 17, 2009

  • 98 Answers

SOURCE: 2001 yamahra YZF 1000 R has a flat spot in low

your adjusting screws need to be readjusted or you have a clogged jet in the carb.

Posted on Feb 25, 2010

  • 310 Answers

SOURCE: Flat spot when excellerating in 1st gear between

good day just ask the qualified honda tech. to fix your problem.

Posted on Jun 21, 2010

  • 1 Answer

SOURCE: why does my DT125 splutter at hight revs

had the same problem, all i needed to do was change the sperk plug! nearly stripped the bike right down aswel!

Posted on Oct 27, 2012

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1 Answer

My triumph Daytona 955i has developed a flat spot between 2000/3000 rpm. tick over is fine and no problems at high speeds, everything is standard spec.

Hi, Brian and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition and leaking.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, module, and or sensor.
5. Battery nearly discharged.
6. 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.
7. Intermittent short circuit due to damaged wire insulation.
8. Intake air leak.
9. Water, dirt, or rust in the fuel system, fuel pump and/or filter.
10. Faulty fuel pressure regulator
11. Pinholes in the in tank plastic convoluted tubing from the pressure regulator to the quick disconnect check valve.
12. Fuel tank vent system plugged.
13. Throttle body controls misadjusted.
14. Damaged throttle body or intake seals.
15. Loose, dirty, or corroded ignition module connector at crankcase.
16. Faulty MAP, CKP, O2, and/or CMP sensors.
17. Incorrect valve timing.
18. Weak or broken valve springs.
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1 Answer

Flat spot between 5000 & 6500 rpm

Has something to do with you timing and valve adjustement. Get it tuned the way it supposed to. Or just get performance. Its hitting a flat spot because the valve are floating inside the case when it goes too fast and doesn't have the proper performance added to the inside components.Have to have the right components to fit together correctly for the exact way you want your bike to run.

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I have a 89 katana that cuts out at 5000 rpm

The power regulator may be at fault.
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2 Answers

Why does my DT125 splutter at hight revs

Sounds like either the bike is starving for gas at higher RPM's, or you're hitting the rev limiter.

Jun 15, 2012 | Yamaha DT 125 R Motorcycles

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.
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Boat does not plane

you could try a lower pitched prop.2" would up the revs by 400 revs.,which would up the revs ,but give you more low down thrust,and/or tucking the motor under more[if you have electric trim/tilt].thats a big boat and fair bit of weight for a 40hp merc is on a 13ft saracen,and with two of us it takes a while to get i bought a ProPulse prop,with adjustable pitch.been god to try different pitches

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1 Answer

Do i turn my power valve clockwise or anticlockwise to open it on a dtr 125 2003 model

if you are turning to open up the valve for more power then you are making a mistake. power valves open the upper exhaust ports to allow the exhaust gas to exit faster being pulled by the exhaust pulses from the expansion chamber. by opening it and setting it in the fully open position would rob the engine of all its low down power making the bike useless below 5000 rpm which is where your power valve would start to open, it would also waste fuel as it would be sucked straight into the ex possible causing lean running conditions .

Apr 25, 2010 | 2003 Yamaha DT 125 R

1 Answer

My 2000 650 dakar has 5000 miles with regular maintenance my problem is a flat spot in the power band around 5.5 rpm

the only way to fix the problem would be to upgrade your endcan or or is a problem with all 650 dakers.just needs tunning up.hope this helps

Sep 25, 2009 | 2001 BMW F 650 Dakar

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Kia Sedona 2003 shaking motor

Have a cylinder leakdown test done...likely they missed another bent valve. I'm betting it's an exahust, because it would be less drivable if it was an intake, but regardless, I'll bet that is your problem.

Sep 22, 2009 | 2003 Kia Sedona

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