DT125R ARCHIVE

ill try that now n post the outcome it aint going over 80kph atm 

What colour is the one you have now? The red ones are the only ones you want for pure power!

Pretty sure you have to ground it off don't you?

Nathlaad wrote:

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Pretty sure you have to ground it off don't you?

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 Came across this for de-restricting using the reed switch wires
Removing Speedo Restriction

The speed is restricted by means of a reed switch which is mounted in the rear of the speedo. It tells the CDI when the bike reaches 60mph and stops the revs from increasing.
To remove the speedo restriction take off the headlamp cowl and pull out the spring clips holding the speedo in. Then unscrew the speedo cable and lift up the clock. You will see two things in the bottom of the clock casing. One is round and is the light bulb for the clock, the other is white and oblong. This is the reed switch and you carefully prise it out and tuck it to one side out of the clock. I suggest you put it in a bag and tuck it as far away as possible. Do not cut or disconnect

 

 

 

Wilksiee wrote:

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turn the powerband switch on

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where is this?

dtr200691 wrote:

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i know there are limitless post about these problems but i can never find a staight anser and most dts are slightly different so any advice would be much appreciated. this is my second dtr 2003 and unlike my first one this runs sweet as a nut but when come to open her up there is no powerband seems to have all its power in lower revs n non atall in high revs the ypvs is connected but turns a slight bit clockwise when turned on, thats all you hear from it please help 

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 From what I gather when you first turn on the ignition, there should be the sound of two quick zipp/whirrs coming from the servo, sounds like your powervalve is stuck in the closed position, might be an idea to check the cables, they can fray and eventually snap, also check the powervalve itself isn't sticking, take off both cables and see if it rotates freely.

Heres a step by step guide of how to set the powervalve and cables up properly. Hope this helps

http://www.dtr125.net/videohtml/ypvs/powervalve.htm

Read carefully regarding the way the cables cross over for your model btw

 

Not sure of the crack when it comes to your model and how the servo is set up from new, mines a 92 model, and a manual set up type, and as I'm still running mine in, the lads who did the re-bore set it to be pinned half way, although have bought the servo and pulley and cables last week, so will be setting my servo up once I've put a few more miles on the engine.
Yours does sound as if it's restricted mind, as the opposite effect of how yours is, is to have it pinned fully open, and nowt going up the lower revs, but a big kick up the backside at around 7k revs.
Try setting it all up from scratch, as per instructions, including cleaning the powervalve, as it can get gummed up a bit, and should sort it for you.

just got 100kph downhill with very strong tailwind so it carnt be reedswitch can it???

Hmm that's strange mate, are your sprockets standard? Even i can get over that with VERY short gear ratios (acceleration setup) While you're at it, whip the snorkel off and do a plug chop after (to make sure you're not running rich), that will make it rev out a lot more.

You don't need to cut the snorkel out just take off the seat and pull it off, it's a black gromet type thang! And just basically go to the bottom of a steep hill and pin the throttle all the way through the gears, until you get to the top of the hill. Ride home and check the colour of the sparkie.

The cables are straight on mine..

no the cables are not crossed n its a 2003 model its dark now n jus finished work will have a look at power valve early hours tomoz n post a few pics for more advice thanks for help lads much appreciated

i had the same problem mate so i just pegged the powervalve open it seems that on mine when i reved it the powervlave closed instead of opening just peg it open alot easier mate

Try crossing the cables over mate. You might have an early servo on a later bike so the servo is turning the powervalve in the wrong direction. You'll just have to try a few things. Try adjust the cable tension first and getting the slot in the pulley to line up with hole in the back of the casing so in the closed position it's all line up, turn the ignition off and back on - it should wizz anti-clockwise then back again. If your goes the other way, take the cables out, swap them over and put it back together - adjust position and cable tension again.