I have an 86 (i think) GPZ400R that i can't get to run on all four. I have checked the fuel and spark and compression, everything seems fine. The bike starts fine but fuel leaks out of the exhaust port where the pipe bolts to the head. Needless to say it runs like shit, no power no pickup, even when i thought it was running on four and was revving like a mutha f#$@er it then ran like crap on a test ride. Im stumped, everyone i talk to seems to think its electrical (the spark isn't the best on any cylinder) i think it maybe the carbs (the diaphram on the cylinder that won't run didn't sit in its grove quite right, ?? ) any help would be much appreciated.
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