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82 GS850GL gas tank swap..need more volume...which ones fit, who has done this

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    82 GS850GL gas tank swap..need more volume...which ones fit, who has done this

    OK, after a very disappointing ride this weekend having to gas up every 115 miles due to the 3.4-3.8 gallon gas tank on my 850 and blowing a fork seal out, for the love of everything.... what other model gas tank fits on this beast. One with more volume, closer to 5 gallons if I can.

    as far as the fork seal, already had sonic springs, seals, hagon rear shocks etc on order to get that done this weekend. I just need a larger tank...very disappointed in the volume.

    If you have one for sale... pm me.

    #2
    Here's one a ways away from here but check out the pics for ideas. Looks to be from a GS 1100 G





    Roger

    Current rides
    1983 GS 850G
    2003 FJR 1300A
    Gone but not forgotten 1985 Rebel 250, 1991 XT225, 2004 KLR650, 1981 GS850G, 1982 GS1100GL, 2002 DL1000, 2005 KLR650, 2003 KLX400

    Comment


      #3
      Originally posted by Burque73 View Post
      Here's one a ways away from here but check out the pics for ideas. Looks to be from a GS 1100 G





      wonder if that is the 5 gallon tank...

      Comment


        #4
        5.8 Gal I believe
        Roger

        Current rides
        1983 GS 850G
        2003 FJR 1300A
        Gone but not forgotten 1985 Rebel 250, 1991 XT225, 2004 KLR650, 1981 GS850G, 1982 GS1100GL, 2002 DL1000, 2005 KLR650, 2003 KLX400

        Comment


          #5
          It is a tank from an '82-84 GS850G, GS1100G, or GS1100GK, but it is NOT a bolt-on swap.
          Last edited by Guest; 05-16-2017, 08:02 PM.

          Comment


            #6
            The tank on your bike has a 4.5 gallon capacity, so you are not going to increase it all that much by going to a 5 gallon tank.

            The one shown is, indeed, from a G or GK, with a 5.8 gallon capacity, but you will have to change just about everything on the front of your bike to be able to use it.

            - The mounts on the frame will need to move forward about two inches. I think there are some mounting points there, they just need to be filled in with the posts.
            - The triple trees will need to be changed to the G style triples.
            - The fork tubes will need to be changed to the G style tubes.
            - The front fender will need to be changed to the G style fender.
            - Not sure whether the speedo drive will need to be changed or not, it has a different mounting angle.
            - If you get an entire front end with a G headlight, you will need to change the mounting ears, too.

            Putting in 3.6 gallons in 115 miles shows an average of 31.9 mpg. THAT is what I would want to change. I just filled my bike this evening after a ride on Saturday. The last part of the ride was 135 miles, I put in 3.7 gallons, which is 36.25 mpg. Quite a bit lower than I usually get, but we were coming into a stiff headwind.

            My 850 usually gets around 38-42 mpg, my wife's 850 gets about 42-48 mpg, but has hit a high of over 55 for several tanks in a row.

            32 mpg shows that you either have the jetting WAY off or you are simply racing around with a HEAVY hand on the throttle.

            .
            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


              #7
              Originally posted by Steve View Post
              The tank on your bike has a 4.5 gallon capacity, so you are not going to increase it all that much by going to a 5 gallon tank.

              The one shown is, indeed, from a G or GK, with a 5.8 gallon capacity, but you will have to change just about everything on the front of your bike to be able to use it.

              - The mounts on the frame will need to move forward about two inches. I think there are some mounting points there, they just need to be filled in with the posts.
              - The triple trees will need to be changed to the G style triples.
              - The fork tubes will need to be changed to the G style tubes.
              - The front fender will need to be changed to the G style fender.
              - Not sure whether the speedo drive will need to be changed or not, it has a different mounting angle.
              - If you get an entire front end with a G headlight, you will need to change the mounting ears, too.

              Putting in 3.6 gallons in 115 miles shows an average of 31.9 mpg. THAT is what I would want to change. I just filled my bike this evening after a ride on Saturday. The last part of the ride was 135 miles, I put in 3.7 gallons, which is 36.25 mpg. Quite a bit lower than I usually get, but we were coming into a stiff headwind.

              My 850 usually gets around 38-42 mpg, my wife's 850 gets about 42-48 mpg, but has hit a high of over 55 for several tanks in a row.

              32 mpg shows that you either have the jetting WAY off or you are simply racing around with a HEAVY hand on the throttle.

              .
              Steve, I wish it was a 4.5 gallon capacity... I am under 4 gallons. Once I got home on Sunday, drained the tank from full 1 gallon at time into a gallon container and then put it in a 5 gallon. got 3 full gallons and just shy of 3/4 gallon on the last one. I would have been happy with 4.5 lol.

              The MPG is misleading, I was putting in 2.8-3.0 gallons at 115-125 miles, around 40mpg. The last two tanks I filled I let it run til I had to flip to reserve. At reserve level I would fill a full 3.0-3.1 gallons. Frankenstein strikes again on the bike lol...

              Comment


                #8
                Originally posted by Blue Falcon View Post
                Steve, I wish it was a 4.5 gallon capacity... I am under 4 gallons.
                In that case, you don't have an '82 tank.

                I think the '81 tanks were 3.5 or 3.8, the '82 and '83 tanks were 4.5.

                You have any pictures of the tank on the bike? Especially from the side.

                .
                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


                  #9
                  Originally posted by Steve View Post
                  In that case, you don't have an '82 tank.

                  I think the '81 tanks were 3.5 or 3.8, the '82 and '83 tanks were 4.5.

                  You have any pictures of the tank on the bike? Especially from the side.

                  .

                  GS850 pinterest

                  Comment


                    #10
                    Yes he has the small tank.

                    V
                    Gustov
                    80 GS 1100 LT, 83 1100 G "Scruffy"
                    81 GS 1000 G
                    79 GS 850 G
                    81 GS 850 L
                    83 GS 550 ES, 85 GS 550 ES
                    80 GS 550 L
                    86 450 Rebel, 70CL 70, Yamaha TTR125
                    2002 Honda 919
                    2004 Ural Gear up

                    Comment


                      #11
                      Originally posted by gustovh View Post
                      Yes he has the small tank.

                      V
                      well...sh.....i mean... poo

                      Comment


                        #12
                        Here's a solution to the L's short fuel supply. Just have to find bags to accommodate it. One extra gallon in each bag.





                        Roger

                        Current rides
                        1983 GS 850G
                        2003 FJR 1300A
                        Gone but not forgotten 1985 Rebel 250, 1991 XT225, 2004 KLR650, 1981 GS850G, 1982 GS1100GL, 2002 DL1000, 2005 KLR650, 2003 KLX400

                        Comment


                          #13
                          I don't know whether to laugh or be serious..... but thanks lol. now to just wire up a fuel pump and switch to auto feed the gas into the tank... I am just gonna suffer with the small tank until I do more research on this conundrum. The goal is to get to 180 miles without refueling.

                          Comment


                            #14
                            Originally posted by Blue Falcon View Post
                            The goal is to get to 180 miles without refueling.
                            When we are out on a longer ride, my wife's bike goes on reserve at about 140-150 miles, and that is with it doing 40+ mpg. With your 32 mpg average, you are going to need a 7 gallon tank.

                            .
                            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


                              #15
                              Originally posted by Steve View Post
                              When we are out on a longer ride, my wife's bike goes on reserve at about 140-150 miles, and that is with it doing 40+ mpg. With your 32 mpg average, you are going to need a 7 gallon tank.

                              .
                              I'm getting 41mpg lol....but thanks for the vote of confidence (3 tanks consistently @41mpg) that 3.x gallon tank is killing me tho. Even at 40 mpg... reserve will kick in at about 120 miles.

                              Comment

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