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  1. #1
    ryandi2's Avatar
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    1992 WR650.. need some info

    hey guys,

    i am working on this old 650 to help some one out and seems to need a carb rebuild..(ran fine when i dumped gas/oil mix down the carb)

    so to start this out. i know it has a mikuni . but is it a 38 mm? i would like to order a rebuild kit for it. i will be contacting john zigler to see if he has one.

    is there any online service Manuel i can download? i looked in both the 2 stroke and old school sections..

    i will also be replacing the fuel lines in the ski. im assuming they are 1/4 size?

    compression on the ski is 155 on each.


  2. #2
    Old Ski Insanity w/rpm500's Avatar
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    go to mikuni of america .com there is a pdf download booklet for your sbn carb...( do a search here on GHPF and you will find its link)
    yours is an SBN and should be the 38 ... get the official mikuni kit only, not an aftermarket your fuel tube's and vent lines are actually smaller than 1/4 in , I'm not sure of actual mm's but IMT, they are 5mm..

    heres a link to a good read here in the ghpf..( youll prob run accross the link in it some where even though most of it is out of the above mentioned manual anyway)


    http://www.greenhulk.net/forums/show...by-the-Pro-s!&
    Last edited by w/rpm500; 09-08-2010 at 01:00 AM. Reason: added the link to carb tuning

  3. #3
    ryandi2's Avatar
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    hey w thanks for all that info!

    hoping to have this think back up and running for her soon..

  4. #4

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    http://www.x-h2o.com/showthread.php?...-%E2%80%93-etc

    Check this! Scroll down for carb manuals

  5. #5
    ryandi2's Avatar
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    i will post some pics up later tonight but inside of the carb looked pretty bad. im going to try and clean it best i can..

    but i might need to get a hole new carb.. any one have a good carb forsale?

  6. #6
    ryandi2's Avatar
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    they look pretty bad.. im trying to clean it now.. and im having a hard time getting the screws out of the jet block.. they feel like the heads are stripping
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  7. #7
    Old Ski Insanity w/rpm500's Avatar
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    nah... those arn't bad as some .. get a hammer driver to remove those screws... be the only way other than replacements

  8. #8
    ryandi2's Avatar
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    ok i will do that.. but i might have a carb for cheap that doesnt need a rebuild so i might go that route..

    so you think this is a 38? i have been told it could be a 44

    edit: and looking at the exploded diagram it looks like its a 44.. the way the fuel nipple is straight and not curved and the fact it has a high and low speed screw and the 38 looks to just have a low

  9. #9
    Old Ski Insanity w/rpm500's Avatar
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    generally aftermarket sbn's are silver/gray painted not black(yours) and also have an R formed in to the pump cover...

    what is the # cast into the venturi? (can be seen looking thru the barrel) there are also numbers stamped on the main body..the mikuni booklet can help I/D some of these carbs...

  10. #10
    ryandi2's Avatar
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    no # on the ventri and i do not see any numbers stamped on the body.. there is a R on the jet side of the cover but i do not htink there is one on the pump side.. there might be though..

    there was a number stamped on one of the butterflys and i think it was E130

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