determing shaft length

[plane jim]

Good evening everyone-how do you determine the length of a shaft-I noticed motor specs of 25 inch shaft or a 20 inch shaft-thanks

[rancherlee]

Shaft length is measured between the inside top of the motor mount bracket (the clamp, the horseshoe,ect) and the front of the cavitation plate with the engine full trimmed in/down. Usually 20" "long shaft" motors usually measure 21"-22" and 25" "extra long" motors measure 26"-27"