check your coil dude, do you set timing statically or with strobe light? plugs will look sooty if running on choke, also check generator charging as weak battery can cause misfiring at higher revs could be fan belt not at correct tension.
worth checking condition of fuse holder itself as sometimes excess heat from shorting can melt insulating plastic around fuse clips quick way to check is blade fuse of correct rating connected to in anfd out wires on fuse box :)
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