Hey mate, you'll be stoked with the performance from all those mods on your bike! A timing advance key wouldn't go astray either and while you have the carbi off, get a set of reeds.
I'm not sure if this headkit comes with a full-circle crank (I don't think it does) but they're only $39 on onminimoto at the moment. The FC crank will allow your engine to rev another couple of thousand revs because it is balanced (won't vibrate though your arse as much either). These extra revs will suit your fatboy too.
If your stock bike was only a 40cc then you'll only have a 32mm stroke and room for a 10mm wrist pin. The 32mm stroke would only give you a displacement of about 47cc and less compression too. The FC crank would give you the full 50cc plus a hand full more revs. The piston that comes with the 6-port headkit has a 12mm wrist pin so make sure you order the FC crank with 12mm pin size. If your bike is a 49cc then it already has a 12mm pin.
If you get the FC crank, it would be a good idea to replace the crankshaft bearings while the crankcases are apart. You'll find these bearings on ebay or you can find the size and go to a local bearing shop (I can't remember the size, anyone know?)
If you have never seen how to install the parts (the timing key is tiny!) go to
Billet Performance Parts and Accessories from ADA Racing and follow the links. This link will be especially helpful when installing and setting up the carbi. It doesn't tell you that the top plug should run a return line back to the tank though... You'll need to go to a hardware store for some parts.
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