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Thread: 03 viper hard start & high hanging idle problems

  1. #1
    Senior Member Open Mod hereismylife's Avatar
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    Question 03 viper hard start & high hanging idle problems

    I clean everything and adjust everything on this every year. pilots are clean. no dirt in carbs..even pulled the carbs off 2 times this year.

    When it is dead cold you can use the choke to start it but not leave it on to long or it will die.

    While it is hot at anytime after sitting you have to give it some throttle to get it started. this dont seem right.

    the high idle down problem.

    This is after a long run or quick hard runs it seems..I road this the same way last year with no problems.

    It just wont come down to idle unless you use the choke. I even brought the idle down and no change.

    I did read here it can be from the exhaust after a hard run but this just happen this year...very annoying

    what is going on here?
    SLED FAQ HERE
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    03 SXVIPER E/R
    01 SXR 700 R
    01 venture 700 E/R
    00 SXR 700 E/R

  2. #2
    Senior Member Stock SRX-SKI's Avatar
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    Default

    maybe the fuel screws are not the same? or is your choke within specs? sounds like carbs, clean but out of spec maybe.

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    Senior Member Stock
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    Default

    throttle cable too tight?

    my 02 runs/starts fine, still likes a bit of throttle on warm starts to fire right up

  4. #4
    Senior Member Open Mod hereismylife's Avatar
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    fuel screws are set a 1 7/8 but I guess 2 is better.

    I a m going to try 2 turn
    loosen the choke very loose
    loosen the throttle very loose...

    It hangs at 4000 and this sucks
    SLED FAQ HERE
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    01 SXR 700 R
    01 venture 700 E/R
    00 SXR 700 E/R

  5. #5
    Junior Member Mini Timbaahb's Avatar
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    Default Air leak

    Check for vacuum leaks throughout the intake side, including head gasket. My Viper requires a light touch to the throttle for warm starts also.

  6. #6
    Senior Member Stock SRX-SKI's Avatar
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    how many miles do you have on you clutch? over time they start to get notch in the clutch weights from wear and tear. your fuel screws sound right, just need a little free play for the choke and throttle, not a whole lot. there is a manual for the viper in the tech section for accurate specs for throttle and choke. start with those, you might as well check the clutch weights quickly while checking throttle and choke.

  7. #7
    Senior Member Open Mod hereismylife's Avatar
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    Quote Originally Posted by SRX-SKI
    how many miles do you have on you clutch? over time they start to get notch in the clutch weights from wear and tear. your fuel screws sound right, just need a little free play for the choke and throttle, not a whole lot. there is a manual for the viper in the tech section for accurate specs for throttle and choke. start with those, you might as well check the clutch weights quickly while checking throttle and choke.
    I had my clutches apart last year and checked things out.
    never thought of the clutches would affect the idle. Why would the clutch hang the idle though? Are you talking about a notch in the rollers?

    here is something else. while I flick the choke it brings it down then it will return to 4000.....I have to hit the choke 2-3 time real quick then it brings it down.
    Last edited by j_k_auto; 01-16-2011 at 04:38 PM.
    SLED FAQ HERE
    Tech Page Index

    03 SXVIPER E/R
    01 SXR 700 R
    01 venture 700 E/R
    00 SXR 700 E/R

  8. #8
    Senior Member Stock SRX-SKI's Avatar
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    yeah i lost track of the hard starting and idling and started thinking too far, it does sound like carb issue but you already mention cleaning them. double check i geuss

  9. #9
    Senior Member Open Mod hereismylife's Avatar
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    Quote Originally Posted by SRX-SKI
    yeah i lost track of the hard starting and idling and started thinking too far, it does sound like carb issue but you already mention cleaning them. double check i geuss
    Yea I pulled them 2 times thinking the pilots got dirty again...

    Very clean....I guess I am going to check the turns again for the 3 time
    SLED FAQ HERE
    Tech Page Index

    03 SXVIPER E/R
    01 SXR 700 R
    01 venture 700 E/R
    00 SXR 700 E/R

  10. #10
    VIP Member stein700sx's Avatar
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    Default

    If you search this topic "Hard to start when warm" you will find out that 95% Yamaha's are like this. Nature of the beast.
    I find that 2 full turns works the best for eliminating idle hang.
    Smart enuf to know that I'm not SMRT enuf to know

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