Chaps, i've had the 5 out today for a blast about. First real go since the engine conversion. Im having trouble with the cooling system still. The problem is the stat opens at 100 deg (89deg stat) then the rad heats up cool water flows round and the engine temp drops to about 80deg. Thing is the temp aint steady, it goes back up to 100 deg then stat opens and back to 80. Its as if the rad is over cooling/too large?? Im using the 172 rad.Any ideas? Is the rad too big??