Judging from the thread title y'all must be from Southern Australia. I've got a cousin in Oz, he lives in Surfers Paradise, his forum name is Crisso.
You should find a wealth of information on this forum, if you can't find what you're looking for just ask. You might want to check out the X4 thread on the 2-stroke section.
G'day Mate,
Lou
Added: My friend in my avatar picture is Aussie, you might recognize her.