The kickstart, oil cooler and spare set of wheels & tyres are worth about £450 so I reckon it makes the TTR good value even if you find work needs doing.
The expensive repairs would involve the starter, starter gears and sprag clutch so check the starter sounds good and no loud clunk from the engine on shut down. Do that a few times as sometimes even a worn sprag might only click on shut down occasionally.
Don't let any problem like this put you off - if there is a problem you should be able to beat the price down to allow for it.