Cover set
K&L Supply Fuel Petpencil Repair Kit 18-5018 https://www.amazon.com/Supply-Fuel-Petpencil-Repair-18-5018/dp/B001KO4ZBU/ref=sr_1_fkmr2_1?ie=UTF8&qid=1487043123&sr=8-1-fkmr2&keywords=valkyrie+fuel+valve+kitDaniel Meyer
I don't recommend the K&L kit...for the OEM petpencil go with the OEM cover set...16953-MBZ-B51 COVER SET, PETpencil - COVER SET, PETpencil $33.01
Or a new valve,
http://www.pingelonline.com/prodcat/fuel-valves.asp, this will lower your fuel reserve unless you modify the stand pipe.
Or this is what I did over 50,000 miles ago, put in an electric shut off run by a relay from the accessory power from the ignition switch,
https://centuryfuelproducts.com/afc-111-12-volt-lockoff-multi-fuel-shut-off-valve (larger orifice if pulling a heavy load at high speeds) and used a filter
https://www.amazon.com/Golan-Inc-Peak-Filter-60-312C-/dp/B00CAYC886?SubscriptionId=AKIAILSHYYTFIVPWUY6Q&tag=duckduckgo-ffnt-20&linkCode=xm2&camp=2025&creative=165953&creativeASIN=B00CAYC886 along with modifying the original shut off
http://www.valkyrieforum.com/bbs/index.php/topic,37577.0.html