hi was that the red head mod he fitted on his rad,there is a warnimg over faulty wrist pins..no probs with the gx 200 in the go kart world ref overheating,so im not expecting any.but it is trail and error..got the bolt-on kit 10,so will rebuild soon,will need to get the hardend rev roller rockers though,got stung for£108 customs tax when i picked the bits up from parcel force 2day..will upload pic of bits,,,