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  1. #1

    Join Date
    Nov 2010
    Location
    Brisbane Australia
    Posts
    5

    Question Help with SBN38 for WR650LX

    So I've got myself a SBN38 off ebay to go on my '89 WR650LX. Not sure what ski it came off but the markings on the carb are '34' on the venturi, 'R' on the jet cover and 'MAG 2 ? 7 7' on the manifold flange (where ? is an unreadable number).

    It's in used condition but generally not too bad, but upon taking the jet cover off I find that its missing the needle and seat assembly. Great.

    I've got a genuine mikuni carb rebuild kit to go through it but I'm going to need the needle and seat assembly and spring and possibly some new jets as I'm unsure if whats in it will be suitable for my ski. The main jet that's in it has 'R 132.5' marked on it, and I havn't had the pilot jet out to check for markings on it.

    Any help would be apprecaited as to what needles/jets/springs etc I should get to get my ski back on the water

    Thanks guys!


  2. #2

    Join Date
    Apr 2006
    Location
    panama city beach 'fl
    Posts
    1,846
    +1
    9
    carb you should be using is 6m610-13 which has a44mm throttle body and 40 venturi with 1.5 needle and seat 115 gram spring high speed jets 115 and lows 115

    cd

  3. #3

    Join Date
    May 2010
    Location
    Panama City Beach Fl
    Posts
    121
    Yea what Chip said.

  4. #4

    Join Date
    Nov 2010
    Location
    Brisbane Australia
    Posts
    5
    So the one I have is no good?

  5. #5
    Old Ski Insanity w/rpm500's Avatar
    Join Date
    Aug 2005
    Location
    Crystal River Fl
    Posts
    2,208
    IMHO the 44 would work great, but for what I am assuming is a stock a lx650 ,a rejeted 38 will run that motor but would be a little lacking in top end power...a 38 will run the 500s great yet may be underpowered as a single carb in a 650...
    the R designator is generally considered an aftermarket 'R'eplacement for o/e applications..
    Check out the mikuni sbn booklet (do a search here, or go to mikuniamerica.com) for recomendations of needles and jet sizes ...
    Group k site has a nice writeup on NOT running oversized carbs so be aware of going to large!!
    Last edited by w/rpm500; 12-21-2010 at 02:08 PM. Reason: re thoughs on usage

  6. #6

    Join Date
    Nov 2010
    Location
    Brisbane Australia
    Posts
    5
    Shoulda done some more research before I brought...oh well.

    So I found two carbs on ebay:

    http://cgi.ebay.com/ebaymotors/ws/eB...m=130461173359

    http://cgi.ebay.com/ebaymotors/ws/eB...m=130463284754

    They're both from WaveRunners and look like 44mm ones...would they be suitable?

    I've asked the seller for the number stamped into the carb, waiting for reply

  7. #7

    Join Date
    Nov 2010
    Location
    Brisbane Australia
    Posts
    5
    Well I ended up getting another carb off ebay, this one is a SBN44 with 3 Z 7 61X 01 stamped into it. Got some new jets and a needle valve for it too. Its in about a million percent better condition than the other one I got too...

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