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Author Topic:   SAKONNET Re-Power with 100-HP OMC
perkunas170 posted 06-16-2004 12:31 PM ET (US)   Profile for perkunas170   Send Email to perkunas170  
Hi Folks. I'm a long-time lurker (thanks for all of the indispensable info over the last few years!)

I just repowered my 68 Sakonnet with a slightly unusual motor - a 2000 Johnson Commercial 100hp (not FICHT, thing's got 4 carbs). I got it as a new leftover, still in the crate, last week for $5,235. Did I get a deal, as I think?

Anyway, my main question is around one of prop confusion. Dealer wanted me to put on a 15x17 but I insisted on trying a 14.25 x 19 for starters, considering the motor I replaced was turning a 13x19 and seemed pretty good. On the maiden testing run last night, with me 210 lbs and a *large* friend (350+), this boat LEAPT out of the water, and at cruising speed, if you goosed the trottle a little, acted like it wanted to "do a wheelie in 2nd gear" to use a motorcycle analogy. Do I need to go to a 14 x 21 prop? Unfortunatly, I don't have a funtioning tach (hopefully today). Any thoughts?


JBCornwell posted 06-16-2004 01:10 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Borrow a tach, Joe.

The only way that I know to select the correct prop for a boat is to run it at WOT and get near the upper end of the operating range. Don't know about your 100C, but I would guess it at 5500rpm.

If you have too little pitch you risk over-revving the engine. If you have too much pitch you will lug the engine.

Good luck. :)

Red sky at night. . .

lerker posted 06-16-2004 01:10 PM ET (US)     Profile for lerker  Send Email to lerker     
whether you need (or can run) a higher pitch prop or not will depend on your WOT rpm. post that data after you get your tach installed.
perkunas170 posted 06-16-2004 01:31 PM ET (US)     Profile for perkunas170  Send Email to perkunas170     
I didn't even get close to WOT last night. Do I need to wait until I've finished the 10 hour break in (any break-in advice appreciated too!) before I properly (pun intended) assess this screw?


Bigshot posted 06-17-2004 10:58 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Get a tach but I doubt a 21". The commercial should have a V6 gearcase but not sure about newer ones. As far as a deal goes, depends on what that $5200 included. you can buy a new 2004 90hp Johnson all day for about $4500(just motor).
jimh posted 06-20-2004 11:57 PM ET (US)     Profile for jimh  Send Email to jimh     
[Changed TOPIC; was "Thoughts and comments on my recent repower?"]

I want to go outboard shopping with Big'. Next time I buy a new outboard I want Nick making the deal!

Bigshot posted 06-21-2004 10:15 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
My bad....Just checked Ed's & 2005's are up to:

90 HP 20" JOHNSON $4,899. Yamaha is $4,999, and E-tec is $6299. The 2004's were $4499 or $4599 I believe. Ed's has good deals but many here have beaten their prices....they are a good place to start.

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