I just bought a 2000 vz800 marauder. it already had cobra drag pipes and has been jetted. it needed spark plugs so i changed them and the bike ran fine. after a couple days of riding i qickly found out why the plugs were shot. it now has a terrible problem with the front cylinder. it cuts in and out through all rpm ranges. mostly the bike just wants to run on the rear cylinder. the carb is getting fuel, and the plug is firing, but when i pull the plug its black with what looks like exhaust soot. definitely not oil. air filters are new. i took the carb off and cleaned it best i could but the problem is still there. the exhaust for the front pipe wont hardly even get hot. it has no exhaust preasure and at times even feels like it has suction. it upsets me that after two days of owning this bike i cant ride it. any and all help would be appreciated.
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.
If the spark plug wire is bad and jumping fire across to the head and therefore the plug not firing completely would that also make the plug black like that?
i HAVE THE SAME PROBLEM WITH MY 2000 SUZUKI MARAUDER VZ800!!! FRONT CYLINDER NOT FIRING!! WHAT WAS THE RESOLUTION FOR YOU????
I also have a cobra exhaust but i dont know if it was jetted..
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SOURCE: 2002 Suzuki Marauder VZ800 Front cylinder does not fire till bike warms up a bit?
Definately try a spark plug first. What does the old spark plug look like? ( white, oil fouled, melted, metallic?). Usually a fuel issue will make the inoperable cylinder very hot. Might have a loose valve guide in the head, or a bent valve.
SOURCE: how many jets are in a 1999 vz800 marauder
If you bought the kit for the bike everything should be there to complete the job with instructions.
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