1990 honda acty 660cc which cylinder is #1,#2 and #3 start counting from the distrubitor. i would think #1 is closest to the distrubitor
It is not for your 660cc engine, but very useful data HONDA. TN Acty. 1982 to 1991. Notes and Illustrations. 545 cm3 http://worldtracker.org/media/library/Car Manuals/HONDA/HO895635.PDF