I would check to see if it just needs fresh grease and a tightening. I get my hands on so many trikes that have never had the steering stem nut tightened in 20 years, i clean em out and pump full of grease and tighten back up. Maybe new balls if needed. The All Balls roller bearing kits are nice also just a pain in the butt to get that lower race off but its do-able.
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1984 Honda ATC200ES "Big Red"
1982 ATC200E "Hondie"
1988 TRX300FW "Project Quad" Still in progress....