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DT125R FORUM

What's missing here?

Scheduled Pinned Locked Moved Carburetor
35 Posts 7 Posters 1.4k Views
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  • P Offline
    P Offline
    Pablo13
    wrote on last edited by Calum
    #1

    I appear to have something missing out of the right hand side of my carb. I imagine its some kind of adjustment screw

    alt text

    Whatever it is, would it make it hold back over 9k? That is the issue I have at the moment. Its a 93, and I've checked and adjusted the power valve, tried it in both 180 Degree positions and re jetted the main jet twice already, and still seem to have the problem, so now am looking at what should be filling this threaded hole next.

    NINJAN 1 Reply Last reply
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  • D Offline
    D Offline
    DTR+NSR
    wrote on last edited by
    #2

    That's just the carb slide stop screw hole, if there wasn't one already fitted the other side, so that wont be your issue.

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  • BluestoesonnoseB Offline
    BluestoesonnoseB Offline
    Bluestoesonnose
    wrote on last edited by
    #3

    Alternative slide stop position for LH and RH carbies, depending on the application or dual carb set up

    2002 DT125R

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  • P Offline
    P Offline
    Pablo13
    wrote on last edited by
    #4

    Cool. Thanks for the replies, I'll keep on scratching me head 🙂

    NINJAN 1 Reply Last reply
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  • NINJAN Offline
    NINJAN Offline
    NINJA
    replied to Pablo13 on last edited by
    #5

    @Pablo13 I would be very surprised if the carb was restricting RPM's, I would look elsewhere for more obvious restrictions if I were you. Such as CDI, exhaust, Post some pics and tell us the specs of your bike, Ie. Which mods it has etc and I'm sure someone on here will have some answers for ya!!! 😉

    SEDUCED BY THE DARK SIDE!!!

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  • NINJAN Offline
    NINJAN Offline
    NINJA
    replied to Pablo13 on last edited by
    #6

    @Pablo13 Also see here for info and tips on derestricting;

    https://dt125r.co.uk/topic/578/derestricting-guide

    SEDUCED BY THE DARK SIDE!!!

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  • P Offline
    P Offline
    Pablo13
    wrote on last edited by Pablo13
    #7

    It does rev higher than 9k, just very slowly, lol. It's a 93 French import, and I didn't think that year bike has any CDI restriction?

    The bike came with an aftermarket exhaust made by Rino Racing, And I've tried a 220 main jet, now on a 240. Might be placebo effect, but might get to 9.5 a touch quicker that it did. Any help would be appreciated 😉

    CalumC 1 Reply Last reply
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  • CalumC Offline
    CalumC Offline
    Calum
    replied to Pablo13 on last edited by
    #8

    @Pablo13 Sounds like powervalve to me.

    Always Originate, Never Pirate!

    NINJAN 1 Reply Last reply
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  • NINJAN Offline
    NINJAN Offline
    NINJA
    replied to Calum on last edited by NINJA
    #9

    @Calum Didn't you post a tutorial on 'How to set-up the powervalve correctly dude? As I can't seem to find it. :pouting_face:

    SEDUCED BY THE DARK SIDE!!!

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  • P Offline
    P Offline
    Pablo13
    wrote on last edited by Pablo13
    #10

    It goes through the cleaning cycle ok when I turn the ignition on, but does sound lethargic doing it. so that would be a new servo/motor thats needed? To be fair I've not tested the battery either, so not sure what kind of condition thats in. That could affect it too couldn't it?

    NINJAN 1 Reply Last reply
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  • NINJAN Offline
    NINJAN Offline
    NINJA
    replied to Pablo13 on last edited by
    #11

    @Pablo13 Yes a battery not pumping out the required volts would surely affect a lot of things.

    SEDUCED BY THE DARK SIDE!!!

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  • P Offline
    P Offline
    Pablo13
    wrote on last edited by
    #12

    PV cables are all adjusted, holes line up etc.

    CalumC 1 Reply Last reply
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  • CalumC Offline
    CalumC Offline
    Calum
    replied to Pablo13 on last edited by
    #13

    @Pablo13 Yeah but on some CDI's it will retard the valve at certain RPM.

    That engine should rev out hard all the way to the red line.

    The best way to eliminate it not being the powervalve is to align the valve up through the exhaust port, then disconnect the servo. And take it for a test ride. Bottom end should be lost, but past 6K it should pull hard to 12k

    Always Originate, Never Pirate!

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  • P Offline
    P Offline
    Pablo13
    wrote on last edited by Pablo13
    #14

    So, check the green black wire is grounded and stick a finger in my exhaust is the next port of call?

    Cheers for the help btw guys 😉

    NINJAN CalumC 2 Replies Last reply
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  • NINJAN Offline
    NINJAN Offline
    NINJA
    replied to Pablo13 on last edited by
    #15

    @Pablo13 LOLLZZZZZ Yep that's the top notch technical diagnosing we all love on this forum dude - very simple but highly effective!!!

    Let us know how you get on??? :grinning_face_with_smiling_eyes:

    SEDUCED BY THE DARK SIDE!!!

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  • CalumC Offline
    CalumC Offline
    Calum
    replied to Pablo13 on last edited by
    #16

    @Pablo13 That's for RE's the green and black wire.

    Just align the valve flush in the exhaust port and disconnect the servo.

    That will eliminate it being the valve.

    Always Originate, Never Pirate!

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  • P Offline
    P Offline
    Pablo13
    wrote on last edited by
    #17

    Cool. Its a bit dark out there now, but I'll let you al know how I got on soon 🙂

    1 Reply Last reply
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  • P Offline
    P Offline
    Pablo13
    wrote on last edited by
    #18

    Its not the valve. I took the exhaust off and aligned the valve, unplugged the servo and it was still the same at the top. What should I look at next?

    CalumC 1 Reply Last reply
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  • CalumC Offline
    CalumC Offline
    Calum
    replied to Pablo13 on last edited by
    #19

    @Pablo13 Cool, you're getting the same issue then?

    Have you done a plug chop? What's the fueling saying? You running snorkel in or out? How old is the spark plug. Is it the correct plug?

    How old is the ignition system?

    Is the air filter clogged up?

    Always Originate, Never Pirate!

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  • P Offline
    P Offline
    Pablo13
    wrote on last edited by Pablo13
    #20

    Yeah still going flat in the higher rpms. Maybe the coil is weak. No plug chops yet, but I stuck a new one in a few weeks back ngk 8 i believe. Also along with a new air filter as it just ticked over 24km.....about 15k miles. Snorkel is in. Problem has been there before the service too. Would be nice to get to the bottom of it 🙂

    CalumC 1 Reply Last reply
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