menglovekai Posted March 27, 2016 Report Share Posted March 27, 2016 (edited) 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, 2016 by menglovekai Quote Link to comment Share on other sites More sharing options...
spen Posted March 27, 2016 Report Share Posted March 27, 2016 Are you sure it isn't just the expansion of the coolant due to heat? Quote Link to comment Share on other sites More sharing options...
menglovekai Posted March 27, 2016 Author Report Share Posted March 27, 2016 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. Quote Link to comment Share on other sites More sharing options...
fantic305 Posted March 27, 2016 Report Share Posted March 27, 2016 Check the cap is fully done up 1 Quote Link to comment Share on other sites More sharing options...
dan williams Posted March 27, 2016 Report Share Posted March 27, 2016 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. Quote Link to comment Share on other sites More sharing options...
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