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Old 12 March 2006, 18:10   #1
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Country: USA
Town: cheb isle
Boat name: re-ta-ta
Make: ab iflatable
Length: 4m +
Engine: 90 tldi
Join Date: Mar 2006
Posts: 6
tohatsu prop help!NEED SPEED!!!!!!

hello,i have the AB 4.50 vsc with the tohatsu 90 tldi. im running a 13.25x16 aluminum.she turns 5800.44 mph...i am ready to get the fastest available prop for tohatsu engines. should i go smaller diameteter with more pitch?
anybody know which stainless brand is fastest out of the box?
thanks to all!
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Old 13 March 2006, 02:48   #2
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Country: France
Town: Plougastel-Daoulas
Boat name: Kristha
Make: Narwhal HD580
Length: 5m +
Engine: Tohatsu 90hp TLDI
Join Date: Feb 2006
Posts: 41
Hello, I'm using a Yamaha 13x19 on my TLDI, top speed is 39 knots @ 5750 rpm whereas the Standard Tohatsu 13.75x17 kept me under 5250 rpm. Yes, I know, it's weird to get more rpm with more pitch but Tohatsu may have its own way to calculate props.
Since my boat is 5.8mtrs long, you can probably expect more speed than your 38 knots with a Yamaha prop, better yield.
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Old 13 March 2006, 05:30   #3
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Country: France
Town: Plougastel-Daoulas
Boat name: Kristha
Make: Narwhal HD580
Length: 5m +
Engine: Tohatsu 90hp TLDI
Join Date: Feb 2006
Posts: 41
One detail: This is an aluminium model K Yamaha propeller I'm talking about, not SS, too many underwater hazards in my area.
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Old 13 March 2006, 08:01   #4
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Country: USA
Town: cheb isle
Boat name: re-ta-ta
Make: ab iflatable
Length: 4m +
Engine: 90 tldi
Join Date: Mar 2006
Posts: 6
thanks for the help,did you need bushing kit for the yamaha prop?
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Old 13 March 2006, 08:23   #5
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Country: France
Town: Plougastel-Daoulas
Boat name: Kristha
Make: Narwhal HD580
Length: 5m +
Engine: Tohatsu 90hp TLDI
Join Date: Feb 2006
Posts: 41
I just used the Tohatsu's thrust washer fore and four 2mm washers aft, The Yamaha guy didn't have any spacers in stock - the only difference is length -.
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Old 13 March 2006, 09:37   #6
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Country: USA
Town: cheb isle
Boat name: re-ta-ta
Make: ab iflatable
Length: 4m +
Engine: 90 tldi
Join Date: Mar 2006
Posts: 6
thank you very much for your help
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Old 01 May 2006, 06:50   #7
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Country: USA
Town: cheb isle
Boat name: re-ta-ta
Make: ab iflatable
Length: 4m +
Engine: 90 tldi
Join Date: Mar 2006
Posts: 6
tohatsu update

well,im thrilled with the cmc jackplate i installed on my 15vsc ab inflatable.im running the 90 hp tohatsu tldi. she turns a 13.25x19 aluminum 5500rpm. and boy am i cookin!!!! the jackplate allows the engine to run higher in the water and achieve the desired rpm. i bet im in the 50 mph range. thats movin for a 15 ft boat.
looking for the next level?INSTALL A JACKPLATE!!!!!!!!!
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Old 01 May 2006, 08:30   #8
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Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Did you get one with setback? How about some pics of your boat???
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Old 02 May 2006, 05:22   #9
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Country: USA
Town: cheb isle
Boat name: re-ta-ta
Make: ab iflatable
Length: 4m +
Engine: 90 tldi
Join Date: Mar 2006
Posts: 6
tohatsu/jackplate

i think its a total of 8" set back with 5.5" of travel. we mounted her high on the transome.she is electric/hydraulic with toggle switch installed on dash.
you can really dial her in with the combined jackplate/trim tilt controls.
i will post photos soon as i get a few.
i have no problems with the tohatsu picking up water with the nose cone about 3/4 above the bottem of hull.
it truley is amazing how it improved my performance.
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Old 30 November 2008, 07:07   #10
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Country: USA
Town: cheb isle
Boat name: re-ta-ta
Make: ab iflatable
Length: 4m +
Engine: 90 tldi
Join Date: Mar 2006
Posts: 6
update

i now have the new cmc high speed hydrualic jackplate as the one i had before crapped out...it was an ebay purchase and was very old.
i mounted the jackplate as high as it could go as well as the engine on the jackplate.
i can now spin the laser 2 13.25x20 5800 rpm...the boat is so fast it is scary...
prior to any jackplate the engine would only spin the aluminum 20 pitch 4000 rpm
plus it really improves my range at half throttle as the performance there is unbelievable.
pretty funny the looks i get when i smoke other boats with twin 200s
go jackplate!!
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