SUZUKI LTR 450

I am checking a Suzuki LTR 450, it has an exhaust overheating, scope up to 450 degrees of temperature and gets red, I want to know possible causes, the coolant remains at low temperature and the problem gives it in 2 munitos after turning on the engine.
If someone helps me, I thank you very much

Hello friend, the truth is that of the squares is not very mine but I have had problems of overheating in cars that are given for three causes by covered exhaust tube, due to compression leaks by the exhaust valves, or for a late dema liting time but in the three cases there is a remarkable engine power of the engine I do not know if that is your case, in any case I hope it serves you.

Thanks, I will check the valves to see how they are