Need more power

scorpio65

Seaman Apprentice
Joined
Aug 31, 2016
Messages
46
I have a 1967 9.5 that cant get my boat to plane and only does 7mph. I have the chance to get a 1962 10hp. Will I get more speed and power? Will it weigh more than my 9.5?
 

Crosbyman

Vice Admiral
Joined
Nov 5, 2006
Messages
5,450
how big is the boat ?? is the engine tuned properly and firing on both cyl.
 

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Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
49,590
what kind of boat?
how much does it weigh?
what is the health of the motor?
compression numbers?

there is no difference between a 9.5hp and a 10hp that you can measure
 

flyingscott

Fleet Admiral
Joined
Apr 8, 2014
Messages
8,095
I personally would buy the 10 hp motor as long as it is in good running condition. OMC took a step back with the 9.5 hp as far as maintenance costs and performance are concerned. If you want to fix your 9.5 check for spark on both cylinders you could be running on 1 cylinder. Also try running with the hood off those motors are notorious for expensive exhaust leaks.
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
37,851
The 9.5 HP is likely running on 1 cylinder.----The 9.5 list at 60 lbs.----The 62 model 10 is likely 64 LBS.-----I like the 62 and 63 model 10 HP----Easy to work on and consumable parts are easy to find !
 

oldboat1

Fleet Admiral
Joined
Apr 3, 2002
Messages
9,612
10s from the mid-50s to mid-60s were powerful motors. I'm not very familiar with the 9.5, but know the 10 will take the 7 1/2 (same year, condition, same boat) hands down, and will troll down nearly the same.
 
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