943 Radiator temps

This weekend I replaced the pistons and cylinder head on my 943 with the 3204 , s/n 03Y01878. We ran it today for 3 hours and took a heat gun to check temps on the head and radiator. The top tank was 175 the bottom was 148. The head was 150 all the way around. Temps on the exhaust were 500 per hole. I was told my radiator needs to be rod out or cleaned. It is running well. One thing the rpms seems a little low as well , by sound , it sounds like 1800 or so. I can get a photo meter to check...

943 Radiator temps

943 Radiator temps