"Jim Swope jr" wrote in message
et...
I just bought a 1971 Glastron V-170 Crestflite and it came with a 1983 75
horse Evinrude. The markings on the prop say 13-1/4X17.
The engine seems to be running fine at high and low rpm's.I cant hear any
missing. It cruises nicely at low rpm's but when I give it full throttle
It sounds like it is at full
throttle, im getting about 2500 rpms if I remember right. Also with the
cover off and manually holding the throttle at full bore I can only get
about
eight miles an hour out of it according to my hand held gps. At any rate
it goes pretty slow and Im not sure why. Is this engine too small for this
boat.
The recomendation for this boats says not to use any bigger than 125 horse
so Im thinking 75 should be sufficient.I've tried adjusting the plane in
all different positions but dosnt seem to matter much
and get no noticable increase in speed. Any suggestions would be happily
appreceiated.


A 75 hp motor should be fine with that boat. You've got problems with it
though. Could be any number of things, some of which others have suggested.
Hope you didn't pay much. And hope you're handy.