Even if I constantly rev the bike at about 3-5000 rpm it still seems to foul the plug really quickly, did your bike run so rich that it fouled the plug? Once the bike is running properly at standstill I will put the airbox back on. At the moment I cant even ride it as the plugs foul up too quickly.

Maybe it really is another problem but what else can cause the plugs to foul up that quickly?