yeah its complicated, even if you're following part of a group there's no guarantee that they themselves know the way, I've done the correct route twice out of four!
pretty sure it shold have studs not bolts.
Personally I would recommend you buy the correct studs and if the thread is stripped from the cylinder then get someone to fit a thread insert, any local engineering company will be able to do this
Yeah 50 miles on the TTR is enough for me so I'm a soft arse eh lol
Crikey bippo thats some endurance test lass I could never have found that fun but you've got some drive to want to put yourself through that, hey hows the butt doing? give us a ring if you need any help with it haha
burning a hole in the piston can be ignition timing too advanced,
I'd suggest checking the timing and stripping/cleaning the carb and it's jets, you can buy aerosol carb cleaner sprays