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Thread: GN250 running too rich?

  1. #31
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    5th January 2017 - 07:44
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    Quote Originally Posted by Ginge09 View Post
    That's a TK carb by the look of the TK marking on the side...Google is your friend.

    I thought they had Mikuni's originally but who knows.
    Did some googling, think it might be a Nasaki, sound familiar? I’ll be buggered if I can’t fi d any data on them except on aliexpress...

  2. #32
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    5th January 2017 - 07:44
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    Just pulled the carb off. Photos down each hole (oo-er!!)Click image for larger version. 

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    Slide works really smoothly

  3. #33
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    Plug colour, (not from a chop test, just from cruising)

    Click image for larger version. 

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  4. #34
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    1st March 2017 - 06:23
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    Good call, way rich.
    Check the choke action
    And remove the jets for cleaning
    High miles, engine knock, rusty chrome, worn pegs...
    Brakes as new

  5. #35
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    Quote Originally Posted by Honest Andy View Post
    Good call, way rich.
    Check the choke action
    And remove the jets for cleaning
    Cheers Andy. Cleaned the carb and jets again today. No difference. The odd thing is that before I took the carb out and cleaned it the other week the only issue was stalling when hot and twisting the throttle at the lights occasionally. I think the pilot jet was a bit clogged and I flushed that out, but now the issue seems to be 1/4 to 3/4 ish throttle (5-6k rpm)....sigh

  6. #36
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    6th May 2012 - 10:41
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    Quote Originally Posted by globe View Post
    Cheers Andy. Cleaned the carb and jets again today. No difference. The odd thing is that before I took the carb out and cleaned it the other week the only issue was stalling when hot and twisting the throttle at the lights occasionally. I think the pilot jet was a bit clogged and I flushed that out, but now the issue seems to be 1/4 to 3/4 ish throttle (5-6k rpm)....sigh
    you have of course done a search for "motorcycle carburettor tuning" eh?

    jesus it's like spoon feeding.
    www.dansmc.com/carbs2.htm

  7. #37
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    Quote Originally Posted by Akzle View Post
    you have of course done a search for "motorcycle carburettor tuning" eh?

    jesus it's like spoon feeding.
    www.dansmc.com/carbs2.htm
    Arkle! is that really you? assisting a new member to make a difference, wow. never thought I'd see the day. good work muddatrucker.
    Every day above ground is a good day!:

  8. #38
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    Quote Originally Posted by Akzle View Post
    you have of course done a search for "motorcycle carburettor tuning" eh?

    jesus it's like spoon feeding.
    www.dansmc.com/carbs2.htm
    Read it heaps of times, it’s a good site aye.

  9. #39
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    6th May 2012 - 10:41
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    Quote Originally Posted by globe View Post
    now the issue seems to be 1/4 to 3/4 ish throttle (5-6k rpm)....sigh
    right. so you've "read it heaps of times"

    so you're going to do what now?

  10. #40
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    ..............

  11. #41
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    Quote Originally Posted by Akzle View Post
    right. so you've "read it heaps of times"

    so you're going to do what now?
    Looks like I am going to keep struggling on even though i have read it heaps of times, reading it doesn't mean it suddenly starts working and i suddenly know what the cause of the problem is....not for me anyway

  12. #42
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    So here's the latest. Moved the needle up one notch (lowered the clip by one notch) to richen it up after deciding the misfiring was a result of lean-ness. That made it run fine through all the range of throttle except WOT. Little bit of stalling on idle when the throttle is twisted, but havent tried to adjust the fuel/air screw yet.

    The really annoying thing now is that there is a slight drip from the overflow on the carb but only when the bike is on its side stand not middle stand, I'm guessing the float is too high and hence it drips over when on an angle, other than that I guess the gasket could be rooted.

    Small steps but at least there in the right direction

  13. #43
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    6th May 2012 - 10:41
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    Quote Originally Posted by globe View Post
    So here's the latest. Moved the needle up one notch (lowered the clip by one notch) to richen it up after deciding the misfiring was a result of lean-ness. That made it run fine through all the range of throttle except WOT. Little bit of stalling on idle when the throttle is twisted, but havent tried to adjust the fuel/air screw yet.

    The really annoying thing now is that there is a slight drip from the overflow on the carb but only when the bike is on its side stand not middle stand, I'm guessing the float is too high and hence it drips over when on an angle, other than that I guess the gasket could be rooted.

    Small steps but at least there in the right direction
    rbcifgip.

    now yer getting it.

    probly a bigger stoikofairy in the middle will do ya. then you clip up again. and readjist the pilots.
    i'd say you're right with the float assessment.

    well done grasshopper san.

  14. #44
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    rbcifgip ???

  15. #45
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    Quote Originally Posted by globe View Post
    rbcifgip ???
    means "rep, but c*ssina is a fuckwit and gremlin is a pussy" you'll understand in good time son. don't concern youself with it now.

    just keep spinning spanners on the mighty gn.

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