Announcement

Collapse
No announcement yet.

1980 GS850 with BST36SS carbs pilot jet tuning

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #1

    1980 GS850 with BST36SS carbs pilot jet tuning

    I noticed recently that my GS850 is running a bit lean in the pilot circuit. It is running BST36SS carbs with Uni filters and a baffled 4 into 1. The main and needle circuits are perfect but Im getting some popping on deceleration that is more noticeable at night when the ambient temperatures go down as well as some very slight bogging. the fuel mix screw is turned 3 turns out already so its time to either go down 1 air jet size or up one pilot jet size. Im leaning towards going down one air jet size to keep the amount of fuel waste as little as possible. Is this the way to go or should I switch the pilot jets instead?

    Thanks
    Matt
    1978 Suzuki GS750

    Past bikes owned:
    1978 Suzuki GS750E, 1979 Suzuki GS750E, 1980 Suzuki GS850, 1977 Suzuki GS550, 1969 Honda CB350, 1976 Harley Davidson SS175, 1979 Motobecane 50V, 1978 Puch Maxi, 1977 Puch Newport, 1980 Tomos Bullet, 1978 Motobecane 50VLA, 1978 AMF Roadmaster
    Tags: None
    #2
    BST36SS's are very large carbs for a 850, has the bike got some internal mods done or is it stock?
    1984 GS1100GK newest addition to the heard
    80 GS 1000gt- most favorite ride love this bike
    1978 GS1000E- Known as "RoadKill" , Finished :D
    83 gs750ed- first new purchase
    85 EX500- vintage track weapon
    1958Ducati 98 Tourismo
    “Remember When in doubt use full throttle, It may not improve the situation ,but it will end the suspense ,
    If it isn't going to make it faster or safer it isn't worth doing

    Comment

      #3
      As far as I know it's stock. It seems to work really well though.
      1978 Suzuki GS750

      Past bikes owned:
      1978 Suzuki GS750E, 1979 Suzuki GS750E, 1980 Suzuki GS850, 1977 Suzuki GS550, 1969 Honda CB350, 1976 Harley Davidson SS175, 1979 Motobecane 50V, 1978 Puch Maxi, 1977 Puch Newport, 1980 Tomos Bullet, 1978 Motobecane 50VLA, 1978 AMF Roadmaster

      Comment

        #4
        Originally posted by mattd1205 View Post
        As far as I know it's stock. It seems to work really well though.
        Not stock, stock is bs32 cv carbs, the ones you claim
        bst36 ss are stock gsxr carbs and are a flat slide cv carbs
        1984 GS1100GK newest addition to the heard
        80 GS 1000gt- most favorite ride love this bike
        1978 GS1000E- Known as "RoadKill" , Finished :D
        83 gs750ed- first new purchase
        85 EX500- vintage track weapon
        1958Ducati 98 Tourismo
        “Remember When in doubt use full throttle, It may not improve the situation ,but it will end the suspense ,
        If it isn't going to make it faster or safer it isn't worth doing

        Comment

          #5
          Right. I meant internally it seems stock although I didnt pull the head to check the size of the bore in the cylinders.. When I did the valve clearances the cams appeared stock. The carbs do work well with the bike and it doesn't feel overcarbed at all. Should I downjet the air jet or upjet the pilot jet to compensate for the lean condition on the pilot circuit?
          1978 Suzuki GS750

          Past bikes owned:
          1978 Suzuki GS750E, 1979 Suzuki GS750E, 1980 Suzuki GS850, 1977 Suzuki GS550, 1969 Honda CB350, 1976 Harley Davidson SS175, 1979 Motobecane 50V, 1978 Puch Maxi, 1977 Puch Newport, 1980 Tomos Bullet, 1978 Motobecane 50VLA, 1978 AMF Roadmaster

          Comment

            #6
            Can you post pics of the carbs ? What intake pipes do you have on the bike? Not sure 36's would fit stock the intake pipes.
            1984 GS1100GK newest addition to the heard
            80 GS 1000gt- most favorite ride love this bike
            1978 GS1000E- Known as "RoadKill" , Finished :D
            83 gs750ed- first new purchase
            85 EX500- vintage track weapon
            1958Ducati 98 Tourismo
            “Remember When in doubt use full throttle, It may not improve the situation ,but it will end the suspense ,
            If it isn't going to make it faster or safer it isn't worth doing

            Comment

              #7
              go up 1 step on the pilot still may not stop the decal lean misfire. might take 2 steps - and a clip level adjustment on your needle. -- what is in there? 45 or 47.5?
              SUZUKI , There is no substitute

              Comment

                #8
                Trip, don't those carbs typically have 32.5 pilots in them?

                Comment

                  #9
                  Originally posted by GSX1000E View Post
                  Trip, don't those carbs typically have 32.5 pilots in them?
                  i've seen thirty and 32.5.
                  1983 GS 1100E w/ 1230 kit, .340 lift Web Cams, Ape heavy duty valve springs, 83 1100 head with 1.5mm oversized SS intake valves, 1150 crank, Vance and Hines 1150 SuperHub, Star Racing high volume oil pump gears, 36mm carebs Dynojet stage 3 jet kit, Posplayr's SSPB, Progressive rear shocks and fork springs, Dyna 2000, Dynatek green coils and Vance & Hines 4-1 exhaust.
                  1985 GS1150ES stock with 85 Red E bodywork.

                  Comment

                    #10
                    Originally posted by trippivot View Post
                    go up 1 step on the pilot still may not stop the decal lean misfire. might take 2 steps - and a clip level adjustment on your needle. -- what is in there? 45 or 47.5?
                    I think those sizes are stock 1100 pilots...
                    '85 GS550L - SOLD
                    '85 GS550E - SOLD
                    '82 GS650GL - SOLD
                    '81 GS750L - SOLD
                    '82 GS850GL - trusty steed
                    '80 GS1100L - son's project bike
                    '82 GS1100G - SOLD
                    '81 GS1100E - Big Red (daily rider)

                    Comment

                    Previous template Next
                    Working...
                    X