Hi Tom:
Sounds like a challenge.
I'd probably check the ignition system if I thought the fuel supply was working properly.
Replace spark plugs - test run
If there is a manual hi speed adjust screw on the carb, have you tried adjusting it at high RPM?
reply as a comment to this post and I'll try to help.
If that is the bleeder screw, replace it for 2 dollars because the whole caliper is 215 dollars
http://www.polarispartshouse.com/oemparts/a/pol/50362d6bf87002368411640e/brakes-front-caliper
There is a fuse link at the Positive battery terminal wire. It will blow to protect the circuits if the battery is hooked up backwards.
It is a smaller gauge section in the wire that melts to save systems. any auto parts store has one
MDS
Richard, Order new brake line from dealer and ask him to print you off install instructions, or get a manual.
Check the attached links,Manuals and guides, Good luck with your Bike
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ATV Service and Repair ManualsService Manuals for Download in PDFATV TROUBLESHOOTING AND MAINTENANCE
... parts and acces- sories, available through our online store at www.purepolaris.com. Have ... 2012 SPORTSMAN 400/500 HO Owner's Manual. P/N 9923420 ...