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  #1  
Old 08-02-2008, 11:16 AM
kiezman69 kiezman69 is offline
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Default 1978 20CC with 2002 225 optimax

Does anyone have any suggestions on this set-up? It does not seem to get out of the water smooth. It tends to plow through the water before getting on a plane. Tops out at 4800 rpm allowing a speed of 40 mph. I have a 19 pitch aluminum prop on it. I have tried several different props. Any suggestions will be tried. Thanks
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  #2  
Old 08-02-2008, 07:58 PM
NAHIM NAHIM is offline
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Default Re: 1978 20CC with 2002 225 optimax

thats odd. that engines needs to get 5800 rpm. you may need to raise engine. and for sure go down to a 17 pitch.
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  #3  
Old 08-02-2008, 08:04 PM
muddywater muddywater is offline
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Default Re: 1978 20CC with 2002 225 optimax

19 pitch doesn't sound wrong to me. Motor could be mounted too low, but that just sounds too far off. I'm guessing something wrong with the motor. Have you checked to see if it is firing on all cylinders?
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  #4  
Old 08-03-2008, 07:40 PM
kiezman69 kiezman69 is offline
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Default Re: 1978 20CC with 2002 225 optimax

I will try both suggestions, thanks guys!
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  #5  
Old 08-04-2008, 11:06 AM
zach zach is offline
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Default Re: 1978 20CC with 2002 225 optimax

You absolutely should be getting better top-end performance with that motor. As mentioned before, it could be too low. The sluggish start could be attributed to its weight on the transom, but once out of the hole, your top end should be at least 10 mph more.
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  #6  
Old 08-04-2008, 02:10 PM
mnwnvc mnwnvc is offline
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Default Re: 1978 20CC with 2002 225 optimax

I am getting 40.6 gps mph with a 115 OptiMax at 5400 rpm. I wonder if weight is the issue?
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  #7  
Old 08-04-2008, 03:00 PM
Fr. Frank Fr. Frank is offline
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Default Re: 1978 20CC with 2002 225 optimax

The issue isn't weight. The 225 hp will more than make up for the added weight. The issue is with the motor, I promise you.
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