Newbie needs prop help

V

v6james

Cadet
Joined
May 4, 2009
Messages
16
Hi there I have just bought a fletcher gto 17 foot speed boat dunno age really. It has a mercury 150hp think its 1970- 1974 engine. At full throttle and trim up a bit the best i can get out of the boat is 38mph at approx 4800rpm.

Is the above speed the best i can get out of the boat or would another prop help with top end.

The guy gave me two props 1 plastic kind and 1 s/s.

Here is a link to the boat

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEWAX:IT&item=110382261945

any help would be greatly apprieciated plus any other things as approx age and things i should look out for in the engine and boat would be cool.
 
C

Campylobacter

Chief Petty Officer
Joined
Aug 4, 2007
Messages
503
Re: Newbie needs prop help

Do some research and find out what the proper RPM is for WOT on that motor.

I think you may need to drop down a bit a couple inches on the pitch, 4800 seems a bit low for a OB. I could be wrong, I don't know much about early 70's Mercury.
 
C

Campylobacter

Chief Petty Officer
Joined
Aug 4, 2007
Messages
503
Re: Newbie needs prop help

Oh yeah, the SS will give you better performance than the plastic,
 
S

steelespike

Supreme Mariner
Joined
Apr 26, 2002
Messages
19,069
Re: Newbie needs prop help

What is the prop size?Usually on the barrel or under the prop nut.
Is the speed by gps.Be sure its running on all cylinders.
Do a compression check.
 
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