Announcement

Collapse
No announcement yet.

Hot Cam in a GS850?

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    Hot Cam in a GS850?

    I'm curious if anyone on here has installed a hot cam in a GS850, and what the results were?
    Webcam has a set for sale. http://www.webcamshafts.com/pages_ve...zuki/1940.html
    Ryan

    1979 GS850G - currently undergoing a major overhaul
    1986 GSX-R750 - I'm figuring it out

    #2
    I have nothing constructive to add, but i will say that everyone always seems to want to soup up the 850's, always seems like an unconventional choice to me, maybe that's the point?
    1983 GS 1100 ESD

    Comment


      #3
      Why not? Only because it's for the 7,000 to 10,000 RPM range of performance.
      You'll have to upgrade the intake, exhaust, engine and transmission to use that RPM range.
      Almost forgot; tires & suspension too.
      Most of all you'll need a race track to enjoy using that performance range, and track riding is awesome.
      After looking at the whole of it, maybe you wanna do some vintage racing?
      If so, you'll wanna look and learn a lot more about where you wanna go, and what are the best choices for you.
      Last edited by Buffalo Bill; 10-04-2020, 11:27 AM.
      "Only fe' collected the old way, has any value." from His Majesty O'Keefe (1954 film)
      1982 GS1100G- road bike, body, seat and suspension modded
      1990 GSX750F-(1127cc '92 GSXR engine) track bike, much re-engineered
      1987 Honda CBR600F Hurricane; hooligan bike, restored

      Comment


        #4
        Originally posted by greg78gs750 View Post
        I have nothing constructive to add, but i will say that everyone always seems to want to soup up the 850's, always seems like an unconventional choice to me, maybe that's the point?
        Just to be clear, I'm coming at this with zero expectations other than learning from people who probably know better than me...which to be honest is most people on this forum . In other words, I'd love to know more about why you think it's an unconventional choice Greg.
        Ryan

        1979 GS850G - currently undergoing a major overhaul
        1986 GSX-R750 - I'm figuring it out

        Comment


          #5
          Originally posted by Buffalo Bill View Post
          Why not? Only because it's for the 7,000 to 10,000 RPM range of performance.
          Where are you reading that it's only for that range Bill? But to your point, how often am I in the 7000 to 10,000 RPM range for it to make much of a difference.

          Originally posted by Buffalo Bill View Post
          You'll have to upgrade the intake, exhaust, engine and transmission to use that RPM range.
          Almost forgot; tires & suspension too.
          Most of all you'll need a race track to enjoy using that performance range, and track riding is awesome.
          After looking at the whole of it, maybe you wanna do some vintage racing?
          If so, you'll wanna look and learn a lot more about where you wanna go, and what are the best choices for you.
          I have no plans to do any vintage racing. And quite frankly, I'd be willing to change up the exhaust and the intake, but that's about it.
          Several years ago I owned a 78 Honda CB550. One of the common upgrade hacks for that engine is to swap the stock cam for a CB650 cam, was a direct drop in. If you're rebuilding the top end you might as well do it. I did so and noticed a bit of power increase in the higher RPM's, nothing extreme, but you could feel it for sure. Well, I'm planning a top end rebuild on my 79 GS850G and I figured I'd explore the realities of putting in a hot cam. I guess from my perspective I was simply thinking, "nothin wrong with a bit more power!" But it sounds like your point is, but what's the point if your not using it? I'll also note, my GS850 is plenty powerful enough for me. Took her on the freeway recently after months of not riding her and was pleasantly reminded at how much she likes to pull once she's above 45 mph!
          Last edited by RustyTank; 10-04-2020, 03:48 PM.
          Ryan

          1979 GS850G - currently undergoing a major overhaul
          1986 GSX-R750 - I'm figuring it out

          Comment


            #6
            High duration cams are designed to be used in high compression engines. The long overlap timing will bleed off compression and the 850 only has 8.8:1 compression so it's not well suited for that sort of thing. If you want more power I think upgrading to a 1000G would be a nice option. Can't remember off the top of my head if a 1000 engine will fit into the 850 frame but if so, that would be a fun project
            Ed

            To measure is to know.

            Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

            Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

            Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

            KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

            Comment


              #7
              Originally posted by Nessism View Post
              If you want more power I think upgrading to a 1000G would be a nice option. Can't remember off the top of my head if a 1000 engine will fit into the 850 frame but if so, that would be a fun project
              That WOULD be a fun project
              May be worth exploring in the future.
              Ryan

              1979 GS850G - currently undergoing a major overhaul
              1986 GSX-R750 - I'm figuring it out

              Comment


                #8
                I'm sharing some of, but not all my thoughts and experience with sport bikes including my GS1100G.
                I rebuilt and slightly ported my GS1100head, and spent this summer exploring it's limits.
                Risky fun but you wanna keep out of court.
                "Only fe' collected the old way, has any value." from His Majesty O'Keefe (1954 film)
                1982 GS1100G- road bike, body, seat and suspension modded
                1990 GSX750F-(1127cc '92 GSXR engine) track bike, much re-engineered
                1987 Honda CBR600F Hurricane; hooligan bike, restored

                Comment


                  #9
                  Originally posted by Nessism View Post
                  Can't remember off the top of my head if a 1000 engine will fit into the 850 frame but if so, that would be a fun project
                  The two frames have the same part number, so yes, it will fit. I don't remember whether you will need the mounting tabs for the 1000. There is also a possibility that you will also need the driveshaft from the 1000. Not sure if it was the 1000 or the 1100 that had a different size flange at the back of the engine, but the rest of the system would be a bolt on.

                  Oh, second thought: since the 1000G debuted in 1980, it will have electronic ignition, so you will need to change all THOSE parts, too.

                  .
                  sigpic
                  mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
                  hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
                  #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
                  #2 son: 1980 GS1000G
                  Family Portrait
                  Siblings and Spouses
                  Mom's first ride
                  Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
                  (Click on my username in the upper-left corner for e-mail info.)

                  Comment


                    #10
                    Originally posted by Steve View Post
                    The two frames have the same part number, so yes, it will fit. I don't remember whether you will need the mounting tabs for the 1000. There is also a possibility that you will also need the driveshaft from the 1000. Not sure if it was the 1000 or the 1100 that had a different size flange at the back of the engine, but the rest of the system would be a bolt on.

                    Oh, second thought: since the 1000G debuted in 1980, it will have electronic ignition, so you will need to change all THOSE parts, too.

                    .
                    Great info Steve. Thank you sir
                    Ryan

                    1979 GS850G - currently undergoing a major overhaul
                    1986 GSX-R750 - I'm figuring it out

                    Comment


                      #11
                      Sorry, didn't mean to crap in your thread. Been a bit grumpy lately...... Just seems like there are better platforms to spend the kinda money a cam would cost on. I mean the 850 is a great bike, but not exactly svelte, ya know? And by the time you sink the money and the time into it.... would performance gains from a cam be worth it? Just thinking practically. Probably I'm just jealous cause I am parting mine and have no replacement on the horizon...heh.
                      1983 GS 1100 ESD

                      Comment


                        #12
                        Originally posted by greg78gs750 View Post
                        Sorry, didn't mean to crap in your thread. Been a bit grumpy lately...... Just seems like there are better platforms to spend the kinda money a cam would cost on. I mean the 850 is a great bike, but not exactly svelte, ya know? And by the time you sink the money and the time into it.... would performance gains from a cam be worth it? Just thinking practically. Probably I'm just jealous cause I am parting mine and have no replacement on the horizon...heh.
                        I took no offense man. Sounds like you're right, the 850 just isn't really a good bike for that application. No sweat though. And again, I'm really sorry about your recent accident. I hope things on the insurance side of things end up in your favor. You'll be back on a horse before you know it
                        Last edited by RustyTank; 10-07-2020, 11:27 AM.
                        Ryan

                        1979 GS850G - currently undergoing a major overhaul
                        1986 GSX-R750 - I'm figuring it out

                        Comment


                          #13
                          I have no qualms about hopping up any engine if that's what you want. Guys still build 302 Chevies and Fords when the outwardly identical bigger engine drops right in for far less time & money. Shoot, I've got an old 250 inline 6 in my Chevy truck we are getting parts gathered up for.....just because. I could drop in a smallblock & double the horsepower for the same money, but, no.....just no.

                          Comment


                            #14
                            Originally posted by wymple View Post
                            I have no qualms about hopping up any engine if that's what you want. Guys still build 302 Chevies and Fords when the outwardly identical bigger engine drops right in for far less time & money. Shoot, I've got an old 250 inline 6 in my Chevy truck we are getting parts gathered up for.....just because. I could drop in a smallblock & double the horsepower for the same money, but, no.....just no.
                            Thanks for your two cents wymple. I suppose it just comes down to cost/benefit, right?
                            Ryan

                            1979 GS850G - currently undergoing a major overhaul
                            1986 GSX-R750 - I'm figuring it out

                            Comment


                              #15
                              Originally posted by RustyTank View Post
                              Thanks for your two cents wymple. I suppose it just comes down to cost/benefit, right?
                              Sometimes the benefit being just having done it and learned something by doing. It's hard to put a price tag on experience.
                              97 R1100R
                              Previous
                              80 GS850G, 79 Z400B, 85 R100RT, 80 Z650D, 76 CB200

                              Comment

                              Working...
                              X