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Thread: is a 29mm carb too big

  1. 04-01-2008, 11:19 AM #1
    oldred95
    oldred95 is offline At The Back Of The Pack Arm chair racerFirst time rider
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    is a 29mm carb too big

    Finally measured the carb I'm getting off the XR200 and its a mikuni that measures 29mm. I know that is not the stock XR carb but it seems to run ok other then a little bit of a dead spot around 1/3 throttle. I did some searching and the stock XR carb is 26mm and the general idea is that is plenty of carb for a 200X with the typical mods. Is the 29mm really going to be that much of a difference? It ran reasonably well on the XR but the crank locked up and its getting parted out so now I've got the carb to toy with. Opinions?
    1984 200X bored .040 over, mild port work, K&N filter
    Planning on custom exhaust, XR200 carb and cam
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  2. 04-01-2008, 11:37 AM #2
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    thefox
    thefox is offline Power User Lord of the trike
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    With a good exhaust and the air box lid removed and the work you have listed in the sig. I think as long at you take the time to jet it correctly it should be good as long as it clears the frame.
    1984 Yamaha YT 60 Tri Zinger(current project)
    1983 Yamaha YTM 200 (rear suspension kit)..... long term project
    2004 BMW R1150R
    1972 Honda CT 70
    2007 Lifan 110
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  3. 04-01-2008, 12:03 PM #3
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    edog
    edog is offline I'm like an Original Gangsta...but a post whore instead. The day begins with 3WW
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    Going up a couple mm makes a difference.
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  4. 04-01-2008, 07:38 PM #4
    oldred95
    oldred95 is offline At The Back Of The Pack Arm chair racerFirst time rider
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    Going up a couple mm makes what type of difference?


    Are carb jets pretty much universal?
    1984 200X bored .040 over, mild port work, K&N filter
    Planning on custom exhaust, XR200 carb and cam
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  5. 04-01-2008, 07:49 PM #5
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    edog
    edog is offline I'm like an Original Gangsta...but a post whore instead. The day begins with 3WW
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    Quote Originally Posted by oldred95 View Post
    Going up a couple mm makes what type of difference?


    Are carb jets pretty much universal?
    More power.
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  6. 04-01-2008, 07:57 PM #6
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    thefox
    thefox is offline Power User Lord of the trike
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    Quote Originally Posted by oldred95 View Post
    Are carb jets pretty much universal?
    Sort of. You buy them acording to the brand/size range of carb.
    1984 Yamaha YT 60 Tri Zinger(current project)
    1983 Yamaha YTM 200 (rear suspension kit)..... long term project
    2004 BMW R1150R
    1972 Honda CT 70
    2007 Lifan 110
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