Re: 85 hp force impeller change--How to do??
Could be your thermostat also. (that was my problem)
Basically, you remove a bunch of bolts on the underside of the lower unit, pull the cotter pin on the shift fork, and remove the lower unit and drive shaft assembly. Install new impeller and reinstall lower unit.
You should probably buy a Clymers manual. They only cost $25 or so. Well worth it.