It's a Motad stainless set with the link pipes between 1&2 and 3&4. I'd heard other types caused problems so made sure I got that spec.
I have the same down pipes on mine and it runs cleanly. Did the issues come on suddenly or progressively?Is the choke working correctly and the plungers seating properly when it is released. This was the first thing I checked when it first happened on my sons bike because I had seen a similar problem on an old GS750 Suzuki when the plungers were not seating fully due to corrosion, a shot of WD40 sorted it out. Have you checked all the usual items like wiring for corrosion.Drain the float bowls to see if help first and then check the float heights using transparent fuel line.
i run pipe without link pipes didnt make any difference at all still runs clean through the ful rev range and pulls from anywhere in the revs full throttle partial throttle al very clean and crisp i would say your carbs need a proper clean ultrasonic is the best way to clean them
Where is the pipe a larger diameter. Mine was a straight swap, if anything the end of the pipe for the exhaust was slightly smaller.I have a K&N fitted and so does my son on his
I don't think anyone's had much joy with rejetting the FZS600 carbs. A short length of suitable diameter pipe to slide into the collector might be a cheap solution... certainly easier than finding a set of OEM pipes that haven't already rusted through.Or you could buy new!
No the link pipes are other ones that's just a brace between 2/3 the same that's on your Motad exhaust.