The CDI and coil on these are pretty basic, the CDI is just your jelly bean basic five wire CDI unit with the square plug, they are a dime a dozen on eBay, BangGood, AliExpress, all the chinese stuff uses them to. The Coil is about the same, lots of aftermarket sources for these two parts. Not sure with being in AU how much harder it is to get, but for me those two parts would be like $20-30 on eBay.
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1984 Honda ATC200ES "Big Red"
1982 ATC200E "Hondie"
1988 TRX300FW "Project Quad" Still in progress....