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Thread: Low rev misfire

  1. #1
    Baby Twin
    Join Date
    Sep 2016
    Location
    Lowestoft
    Posts
    4

    Low rev misfire

    Hi guys, i have a low mileage rsv factory(6300 miles ) which i really enjoy however it has an intermittent misfire on a trailing throttle. Big hesitation entering a roundabout yesterday with missus riding pillion & she nutted me in back of head! Recently changed plugs the originals proved to be in good nick. Also motor idles really low when hot and has cut out a few times . Anyone got any ideas??

  2. #2
    Baby Twin
    Join Date
    Jun 2015
    Location
    Norfolk, VA
    Posts
    4
    Sounds like the same problem that I have on my 2008 RSVR. When idling it backfires from the airbox and drops a few RPMs. If I give it a little throttle in neutral it will intermittently backfire and shut off. (Loud clank and engine shuts off) When riding, starting to move from a stop, it will sometimes shut off with the smallest amount of throttle. Doesn't matter if it's warm or cold. I'm thinking the valves need adjusted but I don't want to spend that amount of money if that's not the case.

  3. #3
    Baby Twin
    Join Date
    May 2013
    Location
    Plymouth
    Posts
    36
    There is a few things it could be. Start with the simple and cheapest things to check then move on.

    Lift the tank:

    Check the air filter is clean
    Pull the plugs check your getting a spark
    Change the fuel.
    Check you are getting fuel to the throttle bodies

    Check all the vaccum lines on the throttle bodies are still connected tight and there is no breaks/splits in the pipe.
    Check none of the fuel lines are kinked.

    Check any vaccum blank caps are in good condition and not split.

    With the air filter off open the throttle fully and try and start the bike, check there is fuel coming from both injectors.

    Check the throttle bodies are clean and butterfly flaps are sealing properly.

    There is 2 bullet connectors under the seat. With the engine off connect these, turn key in but don't start the bike. Dish should Appear on the screen followed by either -1, 0 or 1. With the idle adjustment knob just left and blow the tank would out. Diag should show 0.

    If none of the above highlight the problem check resistance of the injectors should be around 12-18 Ohms. The injectors should show similar resistance if there is a big difference will show there is a problem.

    Injectors may not be firing properly, often happens if it's be sat with fuel in for a long period. Some people have tried injector cleaner additive in the fuel to overcome this. Although be careful as too much of this can erode seals

    If you still haven't found anything could be

    Fuel filter
    Ht leads
    Faulty throttle position sensor
    Throttle bodies need setting up properly. If you have recently bought the bike previous owner may have removed mods e.g. Air filter, exhaust or eprom chips/ power commander and never set the bodies up afterwards. Same if you have fitted Any mods the bodies will need setting up properly.

    There are something to have a look at. Define lay have a good look the pipe work and vac caps, if the bike was running fine then all of a sudden became irratic this will likely be the cause.

  4. #4
    Baby Twin
    Join Date
    Sep 2016
    Location
    Lowestoft
    Posts
    4
    Hi guys, thanks for the responses to my plight. Unfortunately the problem has got worse, I've checked the connections of the hoses under the tank because a couple of weeks ago I replaced the plugs and thought that maybe a vacuum hose/ breather may be trapoed, not the case, got it up and running on . Anyone out there got any views tickover warming up nicely til the fans cut in. Hopped on to go for a test ride, turned right to get out of my drive & went about 2 feet, same problem came back only this time I can't even crank the motor over to start the bloody thing. Stripped all the bodywork off and cleaned every connector block I could trace with contact cleaner & made sure that everything was replaced as I found I. Done the side stand switch also the kill switch alongside the starter while I was there!! Am now starting to suspect the starter solenoid might be kaput. Anyone out there got any suggestions? I need to get her up and running again to make the most of the decent riding weather!!!

  5. #5
    Baby Twin
    Join Date
    May 2013
    Location
    Plymouth
    Posts
    36
    Does it start running rough above 93' degrees? But fine before?
    What's the voltage on the actual battery with multimeter?

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