melt down season before means leaned out. did all pistons go/heat damaged? may just be one carb(if multiple carbs) if not focus on air leak around carbs or crank seals. do the ether trick from outside around all connections and seals to see if you can get an engine rpm increase on idle. if not, then carb jets are plugged and caused a lean out.(or overall lack of fuel) fuel filter plugged? weak pump? increasing jet sizes will just mask the real problem, and if it cleans up, it will then run rich.
jets don't wear out, et, so look for the reason it melted(leaned out). will probably explain the crappy running now. keep running it as is and it will probably melt again.
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