Not sure where this data came from but I would be surprised if it were true.The ST2 has 40 more CCs but 1 less hp while running more compression. Should I just not do a ST2 mod?
I have not used water cooled cylinders and converted them to oil cooled yet so I do not know of any pitfalls. I would be concerned with heat transfer as oil does not shed its heat as well as water. The early air cooled cylinders had/have a oil jacket around the cylinders and there were no issues but later (post 99) dropped these for straight air cooling. I must say I would be tempted to try it myself as the st2 cylinders have little to no value they should be cheaper than a bore/plate job.I think I'd use the jugs too and have them modified. There are threads on it. Seems an easier proposition.