2000 501 FC- I just picked it up last night and in low it runs good, but switching to high it idles rough, stalls in first, switching to low it runs up fine and switching to Hi on the fly it starts to backfire and choke up. The original SEM CDI was in a box the previous owner gave me so I do know it's be switched out and he stated the new one has an extra lead for a light that is not in use, so it's not the exact one. The bike has been sitting all winter and ridden twice last year for 6 hrs. (dirty carbs?) I believe it is running too rich as of now even in low, but I assume it is correctly jetted for Colorado (5500ft). I am planning on changing the oil and spark plug out tonight and try to dial in the fuel-air screw, but I am unfamiliar with jets, but many were inluded with the bike. I apologize for not more info on what the CDI is, but I wanted to get an idea of what to look for before I get in there. Could this be the stator going bad and not firing fast enough, if it's another SEM igintion needing replaced, simply bad jetting or too rich mix (1/2 AV gas and regular is in there now). It seems more electrical if it runs fairly smooth in low, but there is still some limited backfire and popping on engine braking, but I'm no expert. All comments welcome. Thanks
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