Re: age and advise on johnson 25hp
TE = tiller, electric start
L= longshaft (20")
ED = 1996
Check, clean, reset or replace plugs
Check compression if you have tester or if any trouble
Check spark
Check/top up gear lube. Suspect seals if any signs of water (milkiness)
Pump impeller maybe if not known when last changed.
Give it a try in a tub and check water flow
Take it out for a spin check for overheating
Read
http://forums.iboats.com/showthread.php?t=158086