Carburetor needle valve probably leaking while engine is not running causing gas to run down the cylinders into the crankcase.
GN4 Honda oil only.
A Honda 400ex is rated to hold 5 quarts of motor oil. This includes the oil stored in the oil pan and the filter which are replaced during an oil change.
1.9 us quarts
about 2 qt.
2.6 quarts
2.3 quarts
2.6 Quarts
10w-40 G4
On a 400ex the engine and transmission share the same oil. So when you change the oil in the engine you are changing the transmission oil as well. That is why you need an ATV or motorcycle oil designed for wet clutches.
1.9 US qts. Be sure to drain oilpan AND crankcase when changing oil.
on the right side of the motor there is a cap with twwo bolts take that off and theres th oil filter it will have a oil line running to it
i use a 20w-50 jaso rated oil. the 50wt. because its an air cooled motor