Just whip the barrels off and good luck.A lesson I've learnt is that if the bike starts to do anything unusual like the temperture starts to rise, it starts missing or it has trouble starting is stop and have a look as its normally the start of a big problem,For example:-at llandow last year mine started missing towards the end of a session but would clear under hard load,when I tried to start it for the next session it would'nt tick over but would rev OK,2 laps in to the next session it stopped,it broke a ring, destroyed a barrel,piston and head,if only i had took a look at the motor earier I might have got away with just a new ring.