1989 Honda FL400R Pilot Service Manual, Page 54Get this manual
COOLING SYSTEM
SYSTEM TESTING
COOLANT
Test the coolant mixture with an antifreeze tester
For maximum corrosion protection, 50-50 solution of ethylene glycol and distilled water is recommended
RADITOR CAP INSPECTION
Remove the radiator shroud (page 15-41 and the radiator cap
1'hp fngilt( must bi ('ool bl'fore removing the radiator rap, or s{'t'erp scalding ma.v N'Sliit
Pressure test the radiator capReplace the radiator cap if it does not hold pressure, or if it's relief pressure is too high or too lowIt must hold the specified pressure for at least six seconds