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2003 Yamaha DT 125 R - Page 2 Questions & Answers
Do i turn my power valve clockwise or
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 .
Yamaha dt 125r power valve
Your barrel? LOL. Sounds like the valves need to be gone through. I would suggest taking and valve train apart and put it back together correctly then go from there.
Hi there i have a yamaha dtr 125
The bike is 19 years old. Caseings will be VERY hard to find. Suggestion; take the case to a welding shop and ask them to weld the crack. Teey will have a MIG or TIG welder which will do the job and the cost should only be about 20 bucks.
No power and splutters
could be that your woodruff key on your flywheel is sheared off and put the timing out a bit, this happened on my bike, or your air filter may be blocked, maybe the floats are stuck in the carb and flooding.
When i have my lights on and apply my brakes my
You have a poor or missing earth on your lights and are getting feedback. Earth with a spare piece of wire each lighting earth point to isolate. The bad earth will be shown when the fault stops by using the tempory earth wire. Remove faulty earths and clean contacts.
How to derestrict my dt 125 r
The bike is restricted in qute a few places Ihave the same bike and have just de restricted mine im not sure what the other guy was meaning about the exhaust but he is right it is restricted if you remove the exhaust you will notice that there is a small pipe that has been welded in to restrict the amount of fumes that escapes this needs removing its held on with 3 welds i took mine ti a local car repar place they removed it for me for £20 . also check to see if your power valve servo is working mine wasnt so ive opend the case that has the pullys on it and put a screw in to hold the valve in mid way position ( i noticed a major diffrence in doing this ) also there is a small peice of rubber that you need to remove from the inlet manifold if you take the carb off and then the 4 bolds that hold the reeds in you will see a square bit of rubber cut this off to make it flush as this messes with the air fuel mixture . under the seat you will also find a snorkle just rip this off just yet another thing to mess with air intake . i have also drilled my air box but i wouldnt advise this if you use your bike in muddy areas unless you dont mind cleaning your carb all the time i would also get an irridum spark plug as it improves throttle responce
Oil light
does it have oil filter? maybe it needs replaced.
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