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cough spit fart studder under 3k rpm

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  • cough spit fart studder under 3k rpm

    runs real ruff under 3k tb with in 5%and tps is right just took my pcII off nothing could it be a coil or a vacuum line

  • #2
    Re: cough spit fart studder under 3k rpm

    Correct me if I am wrong in any of this. Copied from a previous post:

    Under 3K is pretty low for a high compression, short stroke engine. 4K+ is really where it runs better.

    Everyone is going to say sync the throttlebodies and set the throttle position sensor first.

    As I read, ~4K is where the secondary injectors kick in, and the transition is not very smooth. From the factory, the bike runs lean throughout the RPM range, more so in low RPMs.

    Add a TRE. Each gear has it's own map. One unique thing about a TRE is that it will "fool" the bike into thinking it is in another gear. Depending on the resistor value, it will run either 4th, 5th, or 6th gear maps for all gears. Maps get richer as you go up, but are all too lean for optimum performance.


    After 1 year of messing with my TL, I think I finally got it as smooth as it ever will be. Each successive mod helped a little; there hasn't been one cure-all. Yosh box helped the most, but each was important.

    My personal reccomendations, in order:
    TRE - helps some
    Sync TB's and set TPS - frequently go out of adjustment
    41 or 42t rear sprocket - bike will not be as sensitive to throttle changes, particularly in 1st gear
    Remove PAIR - get rid of backfires and allows tuning
    Airbox mod - less turbulence in airbox, smoother airflow
    Aftermarket air filter - better throttle response
    Aftermarket exhaust cans - it's just a matter of time before you do
    Lower temp fan switch - lean bikes run hot
    Yosh-box or Power Commander - after most common mods are done, this is the icing on the cake
    Last edited by Suprachrgd82; 08-26-2010, 12:52 PM.
    You do not talk about Fight Club....

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    • #3
      Re: cough spit fart studder under 3k rpm

      iv own my tl since 01 and i have all those mods done for years now except lower temp switch its never run this bad

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      • #4
        Re: cough spit fart studder under 3k rpm

        Dirty injector, dirty fuel filter, or vac line problem (broken, cracked, unplugged, etc.)

        Easy diagnostics first, then tear into it.
        Use a propane torch, not lit. Discharge gas while the engine is running near the vac lines. Engine speed will increase when you are close to an open line.

        Have you been using fuel with a high ethanol content? Ethanol is known to break down rubber hoses. Fragments of the hoses will deposit in the injectors or filter.
        You do not talk about Fight Club....

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        • #5
          Re: cough spit fart studder under 3k rpm



          Set the TPS, balance the throttle bodies, recheck the TPS. While you're in there look for vacuum leaks. Make sure the TBs are properly seated in their inlet boots.
          "The rifle itself has no moral stature, since it has no will of its own. Naturally, it may be used by evil men for evil purposes, but there are more good men than evil, and while the latter cannot be persuaded to the path of righteousness by propaganda, they can certainly be corrected by good men with rifles."

          Colonel Jeff Cooper, in "The Art of the Rifle"

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          • #6
            Re: cough spit fart studder under 3k rpm

            Originally posted by billybigmac View Post
            runs real ruff under 3k tb with in 5%and tps is right just took my pcII off nothing could it be a coil or a vacuum line
            Hi have a look at the wiring under the r/h side panel you will find the plug with 2 wires its the crank shaft position sensor if its loose it could be the source of your problem also look for corrosion in all the plugs ?

            Hope it helps .
            sigpic

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            • #7
              Re: cough spit fart studder under 3k rpm

              ill try propane and look at the r/h wires ,plugs are new 300miles or so

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              • #8
                Re: cough spit fart studder under 3k rpm

                Originally posted by billybigmac View Post
                ill try propane and look at the r/h wires ,plugs are new 300miles or so
                SORRY L/H side next to the regulator .
                sigpic

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                • #9
                  Re: cough spit fart studder under 3k rpm

                  i didn't see any thing unplugged ran in with propane around the throttle bodies any more ideas guys

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                  • #10
                    Re: cough spit fart studder under 3k rpm

                    Originally posted by Suprachrgd82 View Post
                    .......

                    As I read, ~4K is where the secondary injectors kick in, and the transition is not very smooth. From the factory, the bike runs lean throughout the RPM range, more so in low RPMs..........
                    No secondary injectors on the S. They're on the R and kick in around 6K rpm.

                    If the airbox flapper is still fitted, it opens at around 4K rpm.
                    "I spent most of my money on Scotch, women and cigarettes. The rest I just wasted"

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                    • #11
                      Re: cough spit fart studder under 3k rpm

                      no that was the first mod in1

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                      • #12
                        Re: cough spit fart studder under 3k rpm

                        did you bypass the clutch lever switch?
                        Run over on: '98 TL1000S
                        Riding: '98 TL1000R fighter
                        Drooling over: '02 TL1000R

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                        • #13
                          Re: cough spit fart studder under 3k rpm

                          no the clutch switch is ok

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