The only stock "fuel filter(s)" are little screens on ends of the petcock inlet tubes. Adding an aftermarket one inline between the petcock and the carb is recommended.
A high RPM only issue could be a result of a fuel flow issue, a tank vent issue, a float setting issue, a carb settings issue, or even an electrical issue. I'd start ruling out the easy stuff, but if it was on warranty, I would take it in and make them deal with it.
If you're going it yourself, I would first try to turn the petcock to RES and see if the issue is still present. Does it act exactly the same while in ON and RES? If no problem solved, then it could be the ON tube/screen has a problem. Next, I would see if it was a venting issue. The tank vents through the gas cap key hole on the 49 state models. Maybe crack the cap and see if that helps...if yes, venting may be a problem, if no, move on. Next, I would check the float level setting via the piece of clear tubing method. At high RPM the fuel demand in the float bowl is at its highest. If it's not getting enough, you will have some sputtering issues.
Next, I would check/replace the spark plug, and make sure that the wire is properly attached to see if this made it better.
At this point I'd probably try changing out the fuel. I usually dump the tank into a large funnel feeding a good empty fuel can, which I then dump into my truck that is better suited to dilute and eat up any suspect gasoline. If a fresh tank doesn't solve the problem, I would dump a half a can of Seafoam into the new fuel. Run it a bit. Let it sit for a couple of hours. Repeat over several days so the stuff has a chance to work and break down any small stuff that might be plugging up the carb somewhere. If this doesn't work, then I would move onto getting into the carb.
Next, I'd check the pilot air screw setting. The pilot circuit supplies fuel at all points of revs and throttle, so a setting too lean can be suspect. The screw is hidden under a plug that must be removed to gain access. Once done, the stock setting is about 1 turn out from a light seat. Most of us find about 2.5 turns out to be ideal. If none of this has solved it, I'd remove and get into the carb for inspection and cleaning.
If the carb stuff didn't help, I'd move onto electrical testing. Oh, and also check your airbox to make sure critters didn't nest it during storage. It happens, and it can mess stuff up, including your brain and patience.
FYI, all of the useful stuff you'll need is in the Technical Write-Ups including service manual downloads.
Good luck, and keep us posted.