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Bike revs high at idle

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  • #1

    Bike revs high at idle

    I was wondering if anyone has had this happen....... When I first start my bike it revs pretty high like around 1500 to 1900. When it warms up it drops down to idle around 1000 1100. Well today it dit it like normal but when I took it off the kickstand and stood it upright it reved on it's own back up to 1900 for a little bit then dropped back down. I took it for a ride and it has very little acceleration and around 5000 and on it was kinda sputtering and cutting out (no popping). Any insight into this issue would be appreciated.


    1980 XS1100G
    Tulsa, OK
    Tags: None
  • #2
    That non-exhaust might have something to do with it... These engines need some back pressure from a real muffler to run properly. Have you re-jetted your carbs at all? Have you sync'd them as well?

    Normal idle is 1100 RPMs. Adjust that down, and go from there.
    1980 XS850SG - Sold
    1981 XS1100LH Midnight Special (Sold) - purchased 9/29/08
    Fully Vetterized and Dynojet Kit added, Heated Grips, Truck-Lite LED headlight, Accel Coils, Irridium plugs, TKAT Fork Brace, XS850LH Final Drive & Black SS Brake lines from Chacal.
    Here's my web page devoted to my bike! XS/XJ User's Manuals there, and the XJ1100 Service Manual and both XS1100 Service manuals (free download!).

    Whether you think you can, or you think you cannot - You're right.
    -H. Ford

    Comment

    • #3
      I've rejetted with the dynojet stage 3 and resynced. The mufflers are straight through performace but they do have 12inches of baffles in there that choke down to about 1.5.

      1980 XS1100G
      Tulsa, OK

      Comment

      • #4
        Might have a vacuum leak, check those rubber caps on the carb boots, JAT.
        2H7 (79) owned since '89
        3H3 owned since '06

        "If it ain't broke, modify it"

        ☮

        Comment

        • #5
          C-bug you got me!

          I kept trying to kill your avatar till it dawned on me...



          john
          John is in an anonymous city with an Alamo (N29.519227,W-98.678980)

          Go ahead, click on the bikes - you know you want to...the electrons are ready.
          '81 XS1100H - "Enterprise"
          Bob Jones Custom Navy bike: Tkat brace, EBC floating rotors & SS lines, ROX pivot risers, Geezer rectifier, new 3H3 engine

          "Not all treasure is silver and gold"

          Comment

          • #6
            I'm going to put in the stage 1 jets tonight and see what happens. I have my colortune in the mail so it'll get there eventually.....I'll also check for a vac leak in the meantime. Thanks guys
            1980 XS1100G
            Tulsa, OK

            Comment

            • #7
              dynojet

              what is a dynojet?

              john


              ps - i like your seat.
              John is in an anonymous city with an Alamo (N29.519227,W-98.678980)

              Go ahead, click on the bikes - you know you want to...the electrons are ready.
              '81 XS1100H - "Enterprise"
              Bob Jones Custom Navy bike: Tkat brace, EBC floating rotors & SS lines, ROX pivot risers, Geezer rectifier, new 3H3 engine

              "Not all treasure is silver and gold"

              Comment

              • #8
                JW..........that is a place you REALLY don't want to go to..........unless your bored to tears and like tinkering......me, turn key on....hit START and ride.......also, a spare set of GOOD carbs makes for a good backup before doing the dynojet thing......once done, can't go back.....
                Last edited by motoman; 06-01-2011, 08:08 PM.
                81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.

                Comment

                • #9
                  hi MeatTooth,
                  the dj stage 3 kit is to big for our bikes,
                  even with straight thru exhausts and pods,
                  try the 124 or 128 main jets, also clean/replace the
                  spark plugs after any changes.

                  also hard to tell by the pic but the air box uve
                  made up on the bike might not be doing the engine any favours,
                  as does the exhaust as bug stated.
                  pete


                  new owner of
                  08 gen2 hayabusa


                  former owner
                  1981 xs1100 RH (aus) (5N5)
                  zrx carbs
                  18mm float height
                  145 main jets
                  38 pilots
                  slide needle shimmed .5mm washer
                  fitted with v/stax and uni pod filters

                  [url]http://www.youtube.com/watch?v=3pA8dwxmAVA&feature=mfu_in_order&list=UL[/url]

                  Comment

                  • #10
                    Originally posted by petejw View Post
                    also hard to tell by the pic but the air box uve
                    made up on the bike might not be doing the engine any favours,
                    as does the exhaust as bug stated.
                    I was thinking that as well. Could be that carbs 2 and 3 are getting most of the air and 1 and 4 are starving a bit, that is unless you put runners inside the plenum to account for this.
                    Nathan
                    KD9ARL

                    μολὼν λαβέ

                    1978 XS1100E
                    K&N Filter
                    #45 pilot Jet, #137.5 Main Jet
                    OEM Exhaust
                    ATK Fork Brace
                    LED Dash lights
                    Ammeter, Oil Pressure, Oil Temp, and Volt Meters
                    Green Monster Coils
                    SS Brake Lines
                    Vision 550 Auto Tensioner

                    In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

                    Theodore Roosevelt

                    Comment

                    • #11
                      Originally posted by jwhughes3 View Post
                      what is a dynojet?
                      Dynojet is a company that makes a bunch of different racing-tuned parts and kits for various things. One thing they make is a carb jet set for our bikes. It includes new slide needles, main jets and air jets, along with a drill bit to increase the size of the hole in the slide for air passage (makes the slide move faster). That last item is the only part that you cannot un-do once you've installed the kit, but I've heard that some folks just do the hole drilling without the kit and see improvement in throttle response.
                      1980 XS850SG - Sold
                      1981 XS1100LH Midnight Special (Sold) - purchased 9/29/08
                      Fully Vetterized and Dynojet Kit added, Heated Grips, Truck-Lite LED headlight, Accel Coils, Irridium plugs, TKAT Fork Brace, XS850LH Final Drive & Black SS Brake lines from Chacal.
                      Here's my web page devoted to my bike! XS/XJ User's Manuals there, and the XJ1100 Service Manual and both XS1100 Service manuals (free download!).

                      Whether you think you can, or you think you cannot - You're right.
                      -H. Ford

                      Comment

                      • #12
                        Thanks for the help

                        OMG!!! it's alive! Pulled out the 138 mains and put in the dynojet 128s. Drained all the gas, cleaned carbs and put in some no ethanol 91 with some seafoam. Checked the plugs and they were some weird ngk type so bought the correct ones and they are about1/16 inch longer reach than the PO plugs. Synced the carbs adjusted the mixture screws to 3 turns out and went for a ride..............HOLY HELL this thing has violent acceleration. All of a sudden things were happening way too fast. I was about to give up on this one and sell it as will idle but won't drive. Thanks for the input guys.
                        1980 XS1100G
                        Tulsa, OK

                        Comment

                        • #13
                          I'm not sure what you mean by some weird NGK type plugs, do you mean the wrong NGK plugs? as the OEM plugs are NGK. I'd be careful about length unless your 100% sure the others were the wrong ones, cause too long and the pistons could kiss the plugs and you won't like the results of that.
                          Cy

                          1980 XS1100G (Brutus) w/81H Engine
                          Duplicolor Mirage Paint Job (Purple/Green)
                          Vetter Windjammer IV
                          Vetter hard bags & Trunk
                          OEM Luggage Rack
                          Jardine Spaghetti 4-2 exhaust system
                          Spade Fuse Box
                          Turn Signal Auto Cancel Mod
                          750 FD Mod
                          TC Spin on Oil Filter Adapter (temp removed)
                          XJ1100 Front Footpegs
                          XJ1100 Shocks

                          I was always taught to respect my elders, but it keeps getting harder to find one.

                          Comment

                          • #14
                            No I put the right plugs in (I checked the NGK website before installing). The PO had the wrong plugs in. They were weird looking because the electrode was buried up in the threaded part and the plug reach was very short compared what NGK called the right plugs. I tried to find the part number to see what they went to but had no success.
                            1980 XS1100G
                            Tulsa, OK

                            Comment

                            • #15
                              Just in case. BP6ES is the correct NGK plug.
                              Nathan
                              KD9ARL

                              μολὼν λαβέ

                              1978 XS1100E
                              K&N Filter
                              #45 pilot Jet, #137.5 Main Jet
                              OEM Exhaust
                              ATK Fork Brace
                              LED Dash lights
                              Ammeter, Oil Pressure, Oil Temp, and Volt Meters
                              Green Monster Coils
                              SS Brake Lines
                              Vision 550 Auto Tensioner

                              In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

                              Theodore Roosevelt

                              Comment

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