Hi Scott
What do you mean by the kickstart is slipping ?? If the kickstart pawl in the gearbox isn't engaging there would be no resistance felt at the kick lever, except for the return spring. Or does it engage but when pressure is applied it slips out of engagement. The kick start components in the gearbox can be accessed by removing the outer and inner covers. Sound to me like you'll probably have to have a look inside. If the kick lever was slipping on the shaft you would notice it loose and probably have some metal filings around it. I assume it's not the clutch, if it was slipping from the kickstart then it would be slipping too much to be able to ride the bike.
Graeme.