Question about 2002 Suzuki VL 1500 Intruder LC

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Suzuki intruder 1998 rear cylnder spark plug sooting up rnnning rich bike has cobra pipes front cylinder not sooting up plug

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Hi your carbs need rebuilt if you bought the bike with the cobra pipes on it an aftermarket jet kit has already been installed after time the aftermarket needles wear out and or wear out the emulsion tubes. i had the exact problem tried every thing coils, igniter box etc. check out GMAN INDUSTRIES. COM they will solve your problem. or sell you genuine mikuni parts with the correct jets, pilot screws, and needles.

Posted on Jul 30, 2009

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HI if this is a bike with carbs then I would highly suggest rejetting them with the after market pipes, if it has injectors then I would recomend checking to see if a power commander is availible for the bike so that you can tune the fuel curve, it will help with the performance as well as your fuel problem

Posted on Mar 09, 2009

  • John Cox Mar 09, 2009

    HI if this is a bike with carbs then I would highly suggest rejetting them with the after market pipes, if it has injectors then I would recomend checking to see if a power commander is availible for the bike so that you can tune the fuel curve, it will help with the performance as well as your fuel problem

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My 2002 suzuki intruder 1500vl is backfiring on the back cylnder y is that


This could be any number of things. First consider the most obvious. Change the rear spark plug. Then check the compression in the rear cylinder. If compression is low, it could be a valve sticking or a piston ring wore or a hole in cylinder. If compress is alright, rebuild carbs. I would check out options in a row. I don't think it could be a be the stator or regulator. But it could be. Those would need to be checked out by dealer. Hope tis helps.

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If it's running rich already, a bigger jet will just make it run even richer.

As far as the rear cylinder running hotter, that's just the nature of the beast with a V-Twin engine, because the front cylinder blocks the airflow to the rear.

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It seems there is too much of fuel going into the non firing cylinder thus the blackish spark plug, recheck the float level to that carburater and also check the valve clearance.

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Did you sync the two carbs? If not the rear may be getting all the gas from the rear carb and none to the front. Twist throttle engine off and see if front carb cable is pulling the carb open.
Also unscrew the spark plug boot from the front spark plug wire and trim 1/8th inch off the wire and screw the boot back in. The plug wire end may be corroded on that wire.

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My 98 Suzuki VL1500 has a weak spark to the rear cylinder. i've replaced plug, plug wire, coil, inition module, and stator. I've switched coils and plug wire from one cylinder to the other. The weak spark...


it is probably not a weak spark. if you are determing this because the plug is sooting up and fouling and or the bike is missing or just not running right. your carbs need rebuilt. know of same problem with friends bike. tried eveything. coils igniter etc.. check out g man industries.com give them a call they will explain what is going on with your bike

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1 Answer

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Factory recommended plugs are the best. Ask your local dealer, and he will give you the correct plugs. If you are fouling plugs, look for a too rich mixture, or carbs flooding.

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