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Author Topic:   Prop, original Merc 800 on Nauset
Nausiat posted 07-29-2004 08:27 AM ET (US)   Profile for Nausiat   Send Email to Nausiat  
Any owners that go right back to the 60's? Our newly aquired Nauset (1968) is running the original Merc 800 outboard from 1969. I don't have a tach on this boat and won't have GPS speed until the weekend, however it is running a 19" prop, excellent hole shot and edu-guessing at 40mph at best.

Without the tach I am really at a loss to judge prop size, can't even find anything on the net about gear ratio. Anyone owned this combination that can remember what prop they used? I am thinking it is under propped, or maybe it has been such a long time since I owned an outboard (25 years of I/O's) that I forgot about excelleration?


bill705 posted 08-07-2004 05:43 PM ET (US)     Profile for bill705  Send Email to bill705     
I've got Nauset #37766 that I purchased new in Sept. of 1968 and had to wait till Nov. to get the Merc 4 cyl 80.
I started out with a cupped 21" and ran with that till the kids got bigger and went down to a cupped 19" for the multiple skiers Etc. I've still got it and went to a Merc 100 in late 1990. Never ran with a speedometer, just the tach.
The only thing ever done to the 80 other than plugs was a lower unit seal after about twelve years and they rebuilt the water pump at the same time. When I traded it, the dealer said that the compression was like a new engine.
Good luck with it:
Nausiat posted 08-11-2004 02:25 PM ET (US)     Profile for Nausiat  Send Email to Nausiat     
Ended up going from the 19 to a 23" Michigan Wheel. Not a great prop to say the least. Old Merc 19" would allow for some surfacing but the Michigan simply 'blew out' totally each time you trimmed that little extra. I cleaned up the prop edges and that cured the blow out, but either way, a 23" dropped me right into range at 5200 from 6300, but it also dropped me from 41mph to 38mph..

Engine is proving a pain so looking for a 115 to replace it with anyway..


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