Don’t know if this is the right place for this but seeing as I own a zx6 and an r1 I’m going to see anyways. Lol. I’ve got an 01 r1 that starts fine and revs fine then about 30 seconds in to it it seems like it starts firing on three cylinders or the exhaust is plugged up. Won’t rev up very fast and backfired a little. What I’ve done so far is change the plugs. Cleaned the carb. Changed the battery. Checked all of my wires. Checked my rectifier. Put new connectors on it. Checked all connections and most recent is I pulled off the cables going to my xup on the exhaust to open it up. Thanks fir the help.