Question about 1996 Suzuki VS 1400 Intruder

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Back firing & cutting out

I think that my gas mix is to rich. I dont have a service manual and cant find the gas/air mix adjustment. I also welcome any other advice as to what to try. Problem has been with the rear cylender. I've checked the spark plug, it's good & it's new..thanks

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  • rpet47 Mar 16, 2009

    They are new, however the plug I pulled was black. I have been pretty convinced that the carb is running rich, but a tech told me that they are pre-set from the manufacturer and that there was a cap over the mixture screw that would have to be drilled out in order to adjust. I am not sure if he is right.

  • joe May 11, 2010

    they are covered with a cap that will have to be drilled.

    if you want, you can try changing from a stock air filter to high flow air filter (eg, K&N) to see if you can get more air into the mixture.

  • joe May 11, 2010

    how do the spark plugs look? are they black and/or oily, or are they white like they are new? black is too rich; white is too lean. should look like light brown toast.



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If a stock intruder is running rich it must have a restriction in the air filter or a problem with the carbs. These bike are always way too lean from the factory. Check to make sure the filters are not plugged up. Also if it is truly rich it will start and run well without the choke on. You may have inricheners that need adjusted.

Posted on Sep 07, 2009


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Ok most likely cause for this is jetting (Carbi) and or the air / fuel mix screw set to rich - Well done for noticing though as no where near enough people read their spark plugs and make adjustments - they normally wait til bike don't work before researching?
Simplest and first option would be turn in your air/fuel mix screw quarter to half a turn in (clock wise) this leans the fuel mix slightly
Second option if still not helping from just screw adjustment is put the mix screw back to where it was before and change the pilot jet to a smaller size - the pilot jets have number stamped on them so once you have yours out look for the number and just buy new 1 or 2 sizes smaller (they only about $5 each) then of course go back to fine adjustments on your air/fuel mix screw to find the correct balance
You will very quickly know if your setting is to lean as result of adjustments as you will get back firing when rolling of the throttle if becomes to lean
jetting and air fuel mix adjustments can be annoying sometimes as you may need to go up a bit then down a bit then up again but take your time do very minor adjustments then check results and my tip is only ever change one thing at a time then record the change then test and record the result if you dont you will very quickly forget what you did, not know what to reverse if result was poor and if result was good you won't know exactly what made the improvement.
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Hi and welcome to FixYa,

On most bikes, your described problem indicates too lean a mixture. The air/fuel mix would have to be adjusted by reducing the air through the air adjustment screws. Additionally, you may want to check for any air leak on the air filter, air box and the bottom half of the airbox that is seated to the barbs.

Good luck and Thank you for using FixYa. Happy Holidays.

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