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Thread: TF125 mudbug idle issue

  1. #1
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    TF125 mudbug idle issue

    Got a mudbug thats idling funny - hanging idle.
    usually starts and idles fine.
    sometimes starts and idles high, but wont come down. giving the throttle a quick sometimes brings it back down - but only sometimes.
    usually starts fine, then when you rev it, the idle stays up high where you revved it to.

    Have checked for vacuum leak - couldnt find one.

    Have removed and cleaned / lubed throttle cable - not the issue.

    what else should I look at?

  2. #2
    What you've already looked for - a vacuum leak. Check mains seals...left side will leak air, right side will suck gearbox oil.
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  3. #3
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    Quote Originally Posted by Motu View Post
    What you've already looked for - a vacuum leak. Check mains seals...left side will leak air, right side will suck gearbox oil.
    cheers, will look into that

  4. #4
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    carb needle/main jet - they get a bit bendy and can stick up.
    Slide also, in the top of carb.
    Had a ts what would do that.

  5. #5
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    On top of the above, try take the cable and lid off the carb & try move the slide with your finger.

    Bolt on flange over-tightened, can distort the carb bore. + grit & stuff can get in.
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  6. #6
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    Any indentation on the idle groove in the slide?
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  7. #7
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    Haven't seen that on Mikuni round slides yet. Happens like a bitch on Flats
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  8. #8
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    looks like Motu was right after having spent some time with it today.

    anyone got a recommendation on best place to order online/ - I tried pyramid parts and bits4bikes, but neither list the stuff Ill need for a mudbug!

  9. #9
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    Is this a Bucket motor? If yes then who cares if it idles or not? I vaguely remember one of my buckets actually idle but all the rest would die if you didn't keep on with the throttle.

  10. #10
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    not a bucket engine but I posted this originally in buckets as I know the motors are often used in buckets, and the bucket folk arent shy of fiddling with their engines . . .

  11. #11
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    Quote Originally Posted by tigertim20 View Post
    looks like Motu was right after having spent some time with it today.

    anyone got a recommendation on best place to order online/ - I tried pyramid parts and bits4bikes, but neither list the stuff Ill need for a mudbug!
    Last time i got OE Suzuki seals they were very reasonable - abt $8 ea. That was A50 about a year ago. Avon City in ChCh.

  12. #12
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    Quote Originally Posted by tigertim20 View Post
    looks like Motu was right after having spent some time with it today.

    anyone got a recommendation on best place to order online/ - I tried pyramid parts and bits4bikes, but neither list the stuff Ill need for a mudbug!
    Any local seal or bearing shop should be able to help you out. They are a pretty generic oil seal. Take in the old one as reference.

  13. #13
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    does the mudbug require the engine out and stripped to get at the seal, or can it be done in situ? - cant find a manual onlinr

  14. #14
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    Quote Originally Posted by tigertim20 View Post
    does the mudbug require the engine out and stripped to get at the seal, or can it be done in situ? - cant find a manual onlinr
    Depends which side. IIRC ignition side can be done without stripping the motor, other side requires full motor strip.

  15. #15
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    Quote Originally Posted by jasonu View Post
    Depends which side. IIRC ignition side can be done without stripping the motor, other side requires full motor strip.
    yep - left hand side was easy. apart from my flywheel getting wrecked. sigh. one of the magnets is in pieces, literally. surprised it was running at all.

    dont suppose anyone has a mudbug enine sitting around with a flywheel they could be encouraged to part with?

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