I am not sure of viscosity, but if you have Harley Davidson on your fuel tank, you should use Harley Davidson lubricants. H. D. primary and trans lube or H.D. 20/50 synthetic motor oil will work just fine.
Knowing the year would help answer this better.
I understand you can use the same oil viscosity in both motor & transmission on the 2008 harley roadking!
the hp is 69
Road King
Presently, motorcycles and trikes.
Depends on the make and add ons.
3.5 quarts with filter change
Yes Harley Davidson does sell any hitch carriers for bikes. You can order them online or at your local Harley Davison dealer.
turn the ignition on and off 6 times.
1957
There is NO WAY possible
88 cubic inches or 1,450 cubic centimeters.