im just on the final stages of rebuilding my 1st engine, and it has taken me about 6 months at school. provided you have the tools (by buying or borrowing) you can strip the engine- send away for machining - and if you wanted to learn more you can put it back together yourself.
my 998 was bored out .080" bringing it to about 1062 cc , i have de -shrouded the chambers to accomodate increase in air flow and hopefully velocity. i have a 266 cam and will soon be running a pulsar dizzy and coil, i am hoping for around 50-ish HP.
i think max over size bore for 998 is .100" or .120"
all my machining was done by Graham Russel, and i can tell you his work is great, he will help you out in any way he can.
you will need a variety of tools, especially manuals and ausmini, you will also need plenty of bandaids.
to keep on a tight budget, do most of the work yourself.
also budget for things like gearbox and ancilleries
most of all, have fun
