Question about Yamaha DT 125 RE Motorcycles

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When opening the throttle my 2000 yamaha dtr 125 the power valve does not always work! all though the revs still fly up but i do not get any acceleration!! it sounds quite deep and kind of muffled/choked! and sometimes it clears itself and accelerates really well, but still when topping out of each gear it chokes itself and sounds the same again instead of over reving

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I have this same problem, have you sorted it? if so then how please? thanks

Posted on Feb 02, 2011


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My dtr gets hot easly

Hi, Anonymous and the usual suspects are:
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Oct 06, 2012 | 2003 Yamaha DT 125 R

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125 DT Yamaha won't rev up in higher RPM

Hi, Anonymous and the usual suspects are:
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4. Clogged air filter or exhaust.
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May 28, 2012 | 2000 Yamaha DT 125 R

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My power valve on my dtr 125 is not turning properly and my bike is realy slow got new servo motor and still the same

A have a yamaha dtr 125 it runs but its got no power and the valve moves but isn't kicking what could it be thanks

Apr 29, 2011 | Yamaha DT 125 R Motorcycles

2 Answers

No spark on yamaha dtr 125cc

Sounds like you are flooding the engine with gas. Put in a new spark plug then twist the throttle one time to prime the cylinder. Now get your hands off the throttle and give it a few kicks. Each time you twist the throttle the power valve gives a shot of gas. Too much can flood the engine quickly.

May 17, 2010 | 2000 Yamaha DT 125 R

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

Dtr 125 engine go cart

hi you are DEFINATLEY getting combustion gases into the rad so if th h/gasket is ok then either the head is cracked or the barrel is when it is cold it's probably ok but as soon as it gets hot the crack expands and it gets worse and worse if you can, make up an adapter out of an old spark plug to take an air line blow air in /block off the inlet and exaust ports water/air will come out of rad the other problems are all linked with the water prob hope this helps merlin v12

Aug 19, 2009 | 2000 Yamaha DT 125 R

2 Answers

2000 YZ 125 Breaks up at High RPM. We think its the power valve. any tips would be great

check fuel float level as it might not be able to keep up the flow rate at those revs
or the read valve has become weak

Jul 19, 2009 | 2003 Yamaha YZ 125

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