Posts: 4
Joined: 6/29/2018
Location: WV, USA
I have a 16 kx450f and the other day after i was done riding i saw that the hose to the head was suctioned shut. I checked the radiator and it was full but all the lines have air in them. Looked online and it said to take the cap off and start it to let it bleed the air out but nothing happend.
Posts: 3632
Joined: 4/3/2013
Location: Benton, LA USA
Posts: 4
Joined: 6/29/2018
Location: WV, USA
Posts: 2664
Joined: 10/20/2011
Location: Marlborough, MA USA
take the black plastic cap off the top of left radiator and fill it from the cap side till coolant comes out
Posts: 4
Joined: 6/29/2018
Location: WV, USA
Posts: 4
Joined: 6/29/2018
Location: WV, USA
Posts: 2664
Joined: 10/20/2011
Location: Marlborough, MA USA
Posts: 837
Joined: 3/29/2016
Location: Ithaca, NY USA
Check that your overflow tube isn't plugged or kinked. If not, it sounds like a bad radiator cap.
When the coolant gets hot and expands it vents excess fluid from the overflow. As it cools off and the volume shrinks the pressure in the system drops. The cap is supposed to suck air back from the overflow tube so the system isn't in a vacuum.
