1985 Honda ATC 310R
"Man your 4 wheeler must be fast, cuz you were haulin' ass, when I passed you on 3 wheels"
You need a new case. Looks like a shadetree fix for a hole that was punched through the case.
That case could be fixed by a good welding shop that is setup to TIG aluminum. But it amazes me that it was tossing that much metal shavings around inside and it hasn't killed it! I would go through and inspect everything, clean it all out good. There must be a LOT of shavings in there somewhere.
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1984 Honda ATC200ES "Big Red"
1982 ATC200E "Hondie"
1988 TRX300FW "Project Quad" Still in progress....