GS259 jetting

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  • WayneH
    #1

    GS259 jetting

    Hi all. I have an 81 GS250T engine in an offroad buggy I built. Due to the fabricated exhaust and extended intake track I need to rejet as it is running lean. Does anyone have any idea what the stock pilot and main jet are in this thing. I am looking for both the size and type of jets so I can go ahead and order new jets before I remove the carbs. Here's a pic of the project so far.
    Thanks for any help you can give.

    Wayne
    Tags: None
    • Guest
      #2
      17.5 pilots 115 mains. Nice buggy btw!

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        • SPARKSS
          #3
          Great looking buggy Wayne. Do you have any pics of the drive setup? I'm guessing it's probably chain to the diff's pinion - based on what I perceive the length of the thing to be.

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            • salty_monk
              Forum LongTimer
              GSResource Superstar
              Past Site Supporter
              Super Site Supporter
              • Oct 2006
              • 14001
              • London, UK to Redondo Beach, California
              #4
              Could be there is an adapter on the front sprocket shaft that bolts directly to the diff (engine mounted sideways). This is generally what you do with a bike engine in a car (such as a Caterham 7 or similar). Bolts right up to the prop.

              I've also seen an engine in a mini where the chain goes to a sprocket whcih changes direction of travel & bolts to the diff.....

              Dan
              1980 GS1000G - Sold
              1978 GS1000E - Finished!
              1980 GS550E - Fixed & given to a friend
              1983 GS750ES Special - Sold
              2009 KLR 650 - Sold - gone to TX!
              1982 GS1100G - Rebuilt and finished. - Sold
              2009 TE610 - Dual Sporting around dreaming of Dakar..... - FOR SALE!

              www.parasiticsanalytics.com

              TWINPOT BRAKE UPGRADE LINKY: http://www.thegsresources.com/_forum...e-on-78-Skunk/

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                • cleonard
                  #5
                  It's almost for sure going to need several jets to try before you will get it right. Several shops near me actually stock a whole range of jets, so I can get them as I need them. Call around and you might get lucky in this regard.

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                    • WayneH
                      #6
                      Thanks for all the replies. This forum is awesome! You guys helped me out with ignition problems a year ago and I knew it was the place to ask. Ok I have the stock sizes..does anyone know which jets, ie: large round slotted, small round slotted, pilot with or without holes? I will get a few sizes to dial it in but I don't have a dealer with a variety nearby so will have to order online.Model number of carb? Doesn't seem to be any numbers on the outside.
                      I don't have a closeup of the drive right now..I'll try and get one for you. The engine is mounted same as it would be in a bike, chain to a transmission from a polaris ATV (provides reverse and hi/lo range). From there the chain drops to a fabbed carrier with the sprocket, brake disc and CV flanges I turned in my garage on an old Reed Prentiss lathe. Started out to make a small suspended gocart...turned into an obsession! My buddies an I have a short 1/8 mile dirttrack we ride on for a little friendly competition and this has been a fun way to get out of the house and get creative!
                      Thanks again!

                      Wayne

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                        • Guest
                          #7
                          Check out www.alpha-sports.com/suzuki_parts.htm great website, plus you could order the jets from them.

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                            • fehren2800
                              #8
                              The carb model number is; MIKUNI BS30SS

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                                • WayneH
                                  #9
                                  Thanks everyone. Help is most appreciated!

                                  Wayne

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