Okay guys need a hand. The bike revs all the way in neutral but 1-6 as soon as I hit 4.5k all the power is lost doesn't even feel like it wants to go. The bloke is pretty certain it's electrical but has no idea. The ignition fuse keeps melting but not blowing. I've had whole new wiring loom. New solenoid. Ignition barrel and rectifier. Anyone have any ideas what else it could be.

I'm picking up alternator, starter, fuse box and pick up coils at the weekend but if anyone has any clue at all would be a massive help.

P.s carbs have been fully rebuilt, sonic cleaned and balanced. And the bike has just had a major service aswell.