Derestricting

Return the bike to how it was intended to be!
21 Topics 365 Posts
  • DERESTRICTING GUIDE

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    @NINJA
    Sound 👍

  • Yamaha Dt125RE/X Stock Exhaust Pipe

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  • Missing reed switch

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    @Hark_Ptooie

    It’s a bit of a headfux isn’t it? The read switch might not be a simple magnetic on/off by the looks of it. It might set to a default mode if it the CDI doesn’t detect a continuity in the curcuit?

    @Blasterguy
    It would be helpful to know if it only restricts the revs in top gear, or every gear? I would try joining the wires at least once to see if there’s a change at all…

    It might be easier to get an earlier CDI than a read switch…

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    @SpookDog I'll inspect the power valve from the exhaust port and try to post pictures later, just to be sure
    The bike feels fast and has good acceleration so there's a possibility that it's just my speedometer that's screwed up LoL

  • Servo motor issues

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    1997:
    Screenshot from 2023-09-04 00-57-29.jpg

    Hilarious thing, but it developed a plenitude of electrical problems that I was to inept to manage, so I sold it cheap. Regrets.

  • About the rubber intake manifold.

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    @SpookDog Me on my 170 🤣 No maybe not quite that low, but that's what I've come to appreciate with the Yamaha now.

    You look back 15 years ago when I first used the Athena kit and you'll see a completely different opinion from me.

    But now I have my other screaming two strokes, I am happy to have a DT which doesn't need to be revved to the moon to enjoy. But oh boy I've had some good rips home from work this year on the DT 🙂

  • Derestrict yamaha dt 125 r 1997

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    @markus-w

    We’ve all got bad memory mate, goes with being human 😛 …
    If I don’t write things down I end up doing crazy spinning circles 🤩

  • Yamaha DT 125 DERESTRICTING

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    I'm sorry for my inactivity... Thanks, everyone for helping me out! I opened the power valve and removed the rubber tube that is on top of the airbox. Now the bike gets much more air and breathes as it should, it goes like a beast. THANKS, EVERYONE!!

  • YAMAHA DT 125 E SWISS

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    Yeah, go through the derestriction guide.

    Only when you know it’s properly deristricted can you address why you’re only getting 55-60 mph from your bike. Cause that’s not right restricted or not...

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    @Calum ok mate. Il speak to him about it

  • 1989 French DTr REV LIMITER?

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    @Coreyp90 There's a full derestricting guide pinned to the top of this section. It covers all years and is most informative. 😉

  • Lighten a fly wheel

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    @declan You can take them off.

    Inner rotor kits. But they are not practical for the road. Kill engines and no good uphill.

    But for a flat track they're fine.

  • Can anyone offer any advice

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    @NINJA thanks

  • 2003 DTR Powervalve issues

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    @calum ok cheers

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  • Derestricting 97 DT125r

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    @calum said in Derestricting 97 DT125r:

    @sloanparkes Sounds like the powervalve isn't set up to me.

    Ya well I've moved it back the other way... but it doesn't reg above 65000 in 5th and still sat at 60mph ish I'm so sure it's restricted...

    And ya @NINJA it was right at the bottom and my toolbar on my phone was covering it saying 97 to 99 😧 cheers dude

  • Yamaha dtr 1999 125cc

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    @giorgio95 Must be first DTR with cdi on the back of the oiltank ? Wire in speedo you messed with white/black from the reed switch ? Thats linked to the cdi then ypvs servo. Sounds like it could just be a bad connection in the circuit somewhere if its kicking in when you move it.

    Easiest and proper way to set the ypvs cables on the pully wheel under the cover is like this.

    On the pully wheel in between the cables is a notch in the wheel, when you switch your ignition on and the ypvs spins over its cycle when it comes to a rest the notch should line up with the dot directly behind it. If it does thats it set properly just make sure the cables are tensioned up ok. Same applies if you have to adjust them to get it to line up and then your good to go.

  • Restrictions

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    @CYBER-NINJA Weight is a restriction that affects every single aspect of performance.

  • 2002 DT125R tops out at 60mph ?

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  • De-restricting a DT 125 1994

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    @MIGHTYMAN That was a restriction on the RE models. To be honest the RE's always seemed simpler to derestrict.

    The obvious ones were the exhaust pipe, YAIS (not convinced that's performance lol), Green Black Wire powervalve.

    Older Models were reed switch, some had restrictive pipes,