Ken,
You are correct, the manual says to fill with 3.9 qts. For years I have been adding 4 quarts and have never worried about it. 3.9 qts has never been enough on my bikes either.
Ken,
You are correct, the manual says to fill with 3.9 qts. For years I have been adding 4 quarts and have never worried about it. 3.9 qts has never been enough on my bikes either.