310 overheating problem

[tito450r]

Heello guys. I have a CT 310. It has stock 250r rad and the problem I'm having is that when I ride it like 3 to 4 minutes it start to throw coolant from the radiator reseirvoir hose. I rode it like for 7 minutes on the mx track and it was throwing steam and coolant. I dont have the reseirvoir right now. I only have the hose down to the pipe. The water pump is completely new. What you guys think is the problem??

[LT250Racer609]

blown head gasket

[daman02]

If you head has a head gasket and not o rings check to make sure the ports for the water jackets are lined up correctly. If that is correct i would say check waterpump to make sure there is not something wrong there to keep it from circulating the coolant.

[tito450r]

My head uses orings instead of gasket. What else could be the problem? Do you think I need a oversize rad??

[CorvetteZ06]

i have a pro-x 310 cylindr on my R, and have never had a problem with the stock radiator. but you could try going to an aftermarket larger unit.

[tito450r]

But what else could be if it is not the rad??

[Brett250R]

radiator cap, bad inner o-ring, clogged radiator, obstructed radiator. put your finger in the radiator and rev it, if you feel coolant flow your WP is good (don't mistake vibration for flow) im running a 310 on a stock rad. only reason its apart right now is because the inner o-ring failed and leaked coolant into the combustion chamber

-Brett-

[esr250r86]

Water pump isnt working properly maybe.