I just got a 98 sportster 1800 with twin rotax engines. at low rps both engines are fine. once I get up to 3000 rpms the starboard motor starts surging and according to that tachs, that motor runs about 2000 rpms higher then the port engine. This happens all the way up to full throttle. I have checked the fuel filter, spark plugs, air filter, and all the fuel lines. I'm not sure if there is a throttle position sensor on these or not to check that. Does anyone have any ideas what could be doing this to me?
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