Does this bike have a BB kit?

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  • redruM69
    #1

    Does this bike have a BB kit?

    I FINALLY got my carbs sorted out on my 82' GS750E.

    Pod filters, 4-1 exhaust, stock pilots, aftermarket adjustable needles of some sort... and get this... 122.5 mains (Stock is 112.5)! Needles set 1 notch from richest too!
    It runs awesome now, and with some air correctors ordered from Dynojet, I no longer have the low end hesitation when the throttle is cracked. Plugs are tan too.

    So my question is this.. Why does this bike love fuel so much?? 122.5 should be way too big for this motor, especially at my altitude of 4000ft.
    Most people use 1-2 sizes oversize mains with pipes and pods, at sealevel.
    Im now at 4 sizes larger than stock at altitude, which is about equiv to 5 sizes bigger at sealevel...

    Anybody know an old trick to measuring displacement without ripping the top end apart and measuring? What is the max the 16v 750cc jugs could possibly be already punched out too?

    This motor just doesnt seem to be stock...
    Tags: None
    • Guest
      #2
      When I went to my 1166 kit the jetting didn't change too much. The timing, head and the cam set up does.
      Maybe the stock cams aren't degreed in or you have aftermarket.
      Are you sure it's a 750 engine?

        Comment

        • Steve
          GS Whisperer
          • Jun 2005
          • 35925
          • southwest oHIo
          #3
          Originally posted by chef1366
          Are you sure it's a 750 engine?
          I think that's the whole point of his question: "Does this bike have a BB (big bore?) kit?"

          .
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            Comment

            • TheCafeKid
              #4
              Uhmmm That sounds pretty normal considering your mods. Of course its going to consume more fuel, you have it breathing free-er and running richer. I seriously doubt you have a bore kit in it.

              Example...my 77 GS750B, with pods, VH 4into1, Mains are at 130, and 105's are stock. Clip in the fourth position. I think you're right where you are supposed to be, and yes, its going to suck a bit more fuel now...1-2 sizes for the mains would be ONLY for the pipe, you need to add another 5-6 maybe 7 sizes for the pods. You've introduced a CRAP load of air now. You gotta counteract it.

                Comment

                • doctorgonzo
                  #5
                  On my GS1000 I think 115 is stock and a dynojet kit for pods and pipes puts 155s in, yes, 155.

                    Comment

                    • Guest
                      #6
                      Originally posted by Steve
                      I think that's the whole point of his question: "Does this bike have a BB (big bore?) kit?"

                      .
                      I meant someone bolted in an 1100 engine.

                        Comment

                        • TheCafeKid
                          #7
                          Originally posted by doctorgonzo
                          On my GS1000 I think 115 is stock and a dynojet kit for pods and pipes puts 155s in, yes, 155.
                          True that, but that is in DYNOJET measurements. Which are different from the stock Mikuni measurement. I dont remember which is which, but one is measured in flow rate, the other is simply the size of the hole..

                            Comment

                            • TheCafeKid
                              #8
                              Originally posted by chef1366
                              Nope, he has Mikuni 155 with a Dynojet kit. The dynojets were too big.
                              ehh...Ok, well HE said he had a dynojet kit. I was just stating that they are TWO different measurements. Point is valid, whether he has those jets or not :P

                                Comment

                                • focus frenzy
                                  #9
                                  well on my SV1000 I have..... wait a minute, it's fuel injected, I just uploaded a new fuel curve to the power comander and plug and play.

                                  sorry couldn't resist, I hear so many people say they don't under stand fuel injection and they miss having a carb on their car, something they can work with.

                                  they obviously never tried to get motorcycle carbs to work right.

                                  it took me weeks to get the carbs reasonably straightened out on my 1100E(bought a set from Canada!), I was to the point of wanting to cry at the thought of having to pull them yet again.
                                  with the SV it took a hour to (rejet low mid and high) and most of that time was sitting in front of computer.

                                  I love fuel injection.

                                    Comment

                                    • Guest
                                      #10
                                      Quiet Leon!
                                      Last edited by Guest; 08-15-2008, 11:58 PM.

                                        Comment

                                        • Guest
                                          #11
                                          Originally posted by TheCafeKid
                                          ehh...Ok, well HE said he had a dynojet kit. I was just stating that they are TWO different measurements. Point is valid, whether he has those jets or not :P
                                          I wasn't trying to show you up Josh.
                                          I'll delete my post.

                                            Comment

                                            • focus frenzy
                                              #12
                                              Originally posted by chef1366
                                              Quiet Leon!
                                              hot, cold, wet, dry, just push starter button and ride away!! LOL

                                                Comment

                                                • doctorgonzo
                                                  #13
                                                  Originally posted by TheCafeKid
                                                  True that, but that is in DYNOJET measurements. Which are different from the stock Mikuni measurement. I dont remember which is which, but one is measured in flow rate, the other is simply the size of the hole..
                                                  No, that's converted to Mikuni, It's a 165 Dynojet main. I'm actually a smidge rich and thought about getting Mikuni 152.5 but I'm putting a rebuilt head on soon which may change compression which might effect that, so gonna wait.

                                                    Comment

                                                    • gearhead13
                                                      #14
                                                      I also have an 82 gs750 and it had 112.5 stock. It has a K&N OEM replacment filter, running with the airbox lid off and a V&H 4-1 . I just put in 120 mains and it rips, might be a little rich/lean but it is real close. I have the needles in full rich position but could be richer there as it had more part throttle with 130's in it. AS my dyno butt tells me

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