Well the only option is to go and chat to them about getting a new motor. Depending on how much money you have and how much damage there is, you're best option is to get a replacement F6 bottom end and salvage as much from the old motor as you can. You're basically replacing what broke. Or you could get a motor built with bigger rods and better pistons etc. etc. but it all adds up. If you want more power then that might be a good option?