I'm looking at lower units and noticed there's multiple size shafts for a 86 force 85. Is there a way to tell what I need off the model number (856X6L) or is there a way to measure it?
You measure the transom of the boat.--------20 " high requires a long shaft ( 20" ) motor.-----25" high requires an extra long shaft motor.-------Shaft length does NOT relate to the actual length of the drive shaft that sticks out of the lower unit.
You measure from the flat surface of the cavitation plate to the top
of the drive shaft.
That should be about 20"
25" is a long shaft.
Measuring the transom: center of the transoms top edge
to the bottom of the hull(usually under the drain plug.
Some are 20" some 25" and some 30"
Force made a 20 and a 25
Post a pic of the housing that the lower unit hooks to.
I can tell by looking at the housing what size the lower is.
