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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 09-30-2010
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changing from 4 stroke to 2 stroke

i currently have a 1997 v8 horse honda 4 stroke engine on my ib 24 looking to change to 2 stroke (easier to work on) what size 2 stroke should i use
also the honda wont fit in the well on the boat i am looking to get rid of the o/b bracket
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Old 09-30-2010
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You have a 8 HP four-stroke, why not get a 8-9.9 HP two-stroke to replace it. That would be lighter than the four-stroke and give you about the same HP or a bit more. You'll want a High Thrust prop for the outboard though. Most 8-9.9 HP two-strokes will fit in the outboard well, since the well was probably designed for a two-stroke outboard originally.

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Originally Posted by newhaul View Post
i currently have a 1997 v8 horse honda 4 stroke engine on my ib 24 looking to change to 2 stroke (easier to work on) what size 2 stroke should i use
also the honda wont fit in the well on the boat i am looking to get rid of the o/b bracket
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Old 09-30-2010
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thats what i was thinking the vessel was made in 1966 however as with most islanders from that age i cant find any info on what engine was recommended by factory spec. as far as weight my friend has an 18 hp evinrude and it weighs less than my Honda. I'm looking to get plenty of power but get rid of as much of the weight as i can. thanks for the prompt reply.
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Old 09-30-2010
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Newhall,

I had a 15HP 2 stroke Evinrude, same size and weight as the
9.9HP, on a Coronado 25. Worked great, the 9.9 may have been
enough? Don't know what your well configuration is but if you
do some measuring beforehand you should have an estimate as
to whether it would fit. Suggest you get a long shaft version.
The high thrust props were not available then so we went down
an inch or so from the stock prop and had all the thrust we could use.
We used the motor hard for 10 years with no problems.
On my present 2 stroke motor I switched to synthetic 2 stroke
oil, same 50:1 ratio, and the smoke was noticeably reduced.

Dabnis
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Old 09-30-2010
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Well

If you live in the US the 2 stroke thing is only gonna happen used

If outside the US you may be in and area were there still legal to buy new
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Old 09-30-2010
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It's not illegal but Evinrude does not make a small engine anymore.
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Old 09-30-2010
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Quote:
Originally Posted by newhaul View Post
thats what i was thinking the vessel was made in 1966 however as with most islanders from that age i cant find any info on what engine was recommended by factory spec. as far as weight my friend has an 18 hp evinrude and it weighs less than my Honda. I'm looking to get plenty of power but get rid of as much of the weight as i can. thanks for the prompt reply.
Newhall,

I didn't see your last post before my last reply. Your local Craigslist
may be a good source for a used motor.

Dabnis
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Old 09-30-2010
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I bought my 15hp 2 stroke yamaha around April of this year. Yamaha discontinued production on them the summer before, but many dealers are still sitting on them. Shop around and see if you can get one from them. The new 2 strokes are super engines.
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Old 09-30-2010
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It is a 24' boat... it really doesn't need more than 9.9 HP to move it.
Quote:
Originally Posted by newhaul View Post
thats what i was thinking the vessel was made in 1966 however as with most islanders from that age i cant find any info on what engine was recommended by factory spec. as far as weight my friend has an 18 hp evinrude and it weighs less than my Honda. I'm looking to get plenty of power but get rid of as much of the weight as i can. thanks for the prompt reply.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
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Old 10-02-2010
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i agree with sailingdog. A 9 hp is all that is needed to move the boat. I had a Catalina 22 with a 9 hp 2 stroke ob motor which pushed her just fine!

Tod
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