I have 2012 4RT with 60 hrs of use.Last owner mostly keep it in garage.

I have the hot start problem after long practice that I have to wait 5-10 minute to start it up again .

Today I go ride in quiet park .About 45 minutes of ride I stop and rest myself,after the engine off.

I notice the water boiling sound inside the radiator and see a little amount of water from the drain hose. ( I had checked the water level yesterday).I use the premix coolant from Honda. Air temp is 38 degreeC.

Maybe, if the engine temp is too hot the ECU would not let the engine run.

Is it Ok? Any suggestion?

Edited March 27, 201610 yr by menglovekai

Are you sure it isn't just the expansion of the coolant due to heat?

I quite sure ,it is water boiling sound inside the radiator.

I'll replace the new cap in tomorrow.

Hope it would solve the problem.

Check the cap is fully done up

I don't know about the other problems but coolant systems work under pressure to keep the coolant from boiling. The boiling point goes up under pressure. That's why a pinhole leak causes boil over. Is the any sign of a small coolant leak anywhere that might be depressurizing the system? Yeah making sure the fill cap is sealing is a good start.