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Message: [QUOTE="leonard1, post: 1291261, member: 83383"] The overheating and leaking head gasket was fixed by refitting the head and investing in a torque wrench. I think I have learnt my lesson. Have been away for the weekend just sorting out the bike and it is so much fun to ride. Yes it is still pre-igniting at WOT but I was almost able to elimninate this by running a colder plug and having the choke out at all times. I believe this is telling me that I need to back off the compression slightly. My theory is that by just shaving the head this has cut into the squish band and left a sharp edge. My next move is to smooth this section out which will also take some meat off that should drop the compression. [/QUOTE]