Mike,
As per Clarks catalog, YN (not TN) suffix was stamped on 60-63, 80 HP,
manual transmission and 64, 110 HP, manual transmission too.
Daniel
<<Simple one. What is this? Engine # TO606TN Is this a 60-62 PG?? Does
the date tell me a 60? Can some one tell me how to read the date,
please.>>