I think the problem is the SXR is a bit of an orphan here in Australia. Pretty much everyone rides superjets. Maybe one reason why the wiesco distributor cant get them. My bore is pretty badly damaged and I don't think 83 will be big enough to get rid of the damaged surface. Once I go past 83 I will probably need to get my head modified or get an aftermarket. Have decided to go with the ADA v2 girdled head which can take both 83 and 85mm domes.
Looks like tomski has come to the party with some 84.5s.
What sized domes should I be I be looking at, to run on pump fuel? Our 98 octane is comparable to your 93 octane I believe. Porting is standard