I have bought an 89 gpz600r today.It has done 35k but the engine pulls like a train. I managed to get from Portsmouth to Reading without too much drama however, I noticed that the clutch slips when revving or slaving the engine. Is this an expensive repair and would I need any specialist tools to undertake the repair? I purchased the bike privately on ebay so I donĀ“t have any warranty. Also has anyone got suggestions for the best tyres to suit dry riding?