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what is the recommended rpm range for my 2003 Mercury 40 HSP
what is the recommended rpm range for my 2003 Mercury 40 HSP 2 stroke, I have this motor on a 22 foot pontoon and was informed to get proper performance under load I need to know recommended rpm under… read more
Noel Schembri
Noel Schembri
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Diploma
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I have a sun track 21 foot with a 60 horse big foot mercury.
I have a sun track 21 foot with a 60 horse big foot mercury. i was told that when i brought the boat that the big foot mean that i have the horse power of a 90 horse and the economy of a 60, but the b… read more
Tan
Tan
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I have a 115 merc optimax and was using a merc 13.25 17 pitch,
I have a 115 merc optimax and was using a merc 13.25 17 pitch, prop got chipped so dealer put on a vortex 13.25 17 pitch now the engine is overeving at 30 kph it is at 6500 rpm already. Can the prop m… read more
Tan
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I purchased a 2008 Fisher 240 Tritoon with no motor and then
I purchased a 2008 Fisher 240 Tritoon with no motor and then purchased a Honda 200 Outboard and attached it with honda rigging. The first two times I went out in the boat with my family it would do 40… read more
Jeff G.
Jeff G.
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Vocational, Technical or Trade Scho
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On my Lund boat I used to have a 40 HP 4 stroke Mercury (2001)
On my Lund boat I used to have a 40 HP 4 stroke Mercury (2001) and my boat speed was 31 to 33 mph. With my 40 HP etech (2008), the boat only runs at 25 to 27 mph. The dealer indicated that they optumi… read more
Jason
Jason
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Vocational, Technical or Trade Scho
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I just recently purchased a 2004 Evinrude 135 HP V6 outboard. It
I just recently purchased a 2004 Evinrude 135 HP V6 outboard. It came on a Sprotcraft 210. 20 degree deadrise, 2,000 lb. displacment, 21 foot center console. Currently the outboard came with a 14 3/4 … read more
Jeremy R.
Jeremy R.
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i have a 2006 crestliner pontoon boat with a 2005 mercury 75hp
i have a 2006 crestliner pontoon boat with a 2005 mercury 75hp mercury engine. what kinda spped should i be getting with just me and not much fuel? also i find if i trim up just a little below cavitat… read more
Jason
Jason
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Vocational, Technical or Trade Scho
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purchased "new" 2006 johnson 90hp v4 2stroke for 20 foot pontoon
purchased "new" 2006 johnson 90hp v4 2stroke for 20 foot pontoon ('06 Bentley with lifting strakes), and this motor cavitates over 4000 rpm (was equipped with '03 merc 75). which size and type of prop… read more
Tan
Tan
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i hsave a 96 crest 18 ft pontoon with a 70 hp johnson. the
i hsave a 96 crest 18 ft pontoon with a 70 hp johnson. the helm is located at the rear. the boat is rated 1900 lbs/75hp . when i am towing a tube, the majority of the outboard shaft is under water and… read more
Jason
Jason
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Vocational, Technical or Trade Scho
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I am thinking to purchase a 115 hp / 4 stroke engine for my
I am thinking to purchase a 115 hp / 4 stroke engine for my odessy 23 foot pontoon boat.....repacing 40 hp that goes very slow. boat is rated for 130 hp. Is this a good choice? What shaft length is ne… read more
Jason
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Vocational, Technical or Trade Scho
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I have a 25 foot 1999 Bennington pontoon boat with a 1999 50
I have a 25 foot 1999 Bennington pontoon boat with a 1999 50 HP Merc 4-stroke big foot. I need a new prop. The one that's on the motor, I found out was not an original Merc prop, even though I bought … read more
Whitecap36
Whitecap36
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I have a 22 foot Misty Harbor pontoon with a 50 hp Merc Bigfoot.
I have a 22 foot Misty Harbor pontoon with a 50 hp Merc Bigfoot. After being on the water for a while, shifting in and out of gear, I run into a problem. When I push the throttle forward I can idle fo… read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
1,545 satisfied customers
I have a 20 ft pontoon boat that came with a 40 hp mercury/force.
I have a 20 ft pontoon boat that came with a 40 hp mercury/force. I swapt the motor with a 120 hp elpt mercury/force with a 21 pitch prop. Its a dog. What is the right prop?… read more
capt ron 1959
capt ron 1959
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Vocational, Technical or Trade Scho
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Hi. I have a 2006 Mercury ( Tohatsu) 25hp 4 Stroke outboard
Hi. I have a 2006 Mercury ( Tohatsu) 25hp 4 Stroke outboard on a 19 foot pontoon boat. The recommended rpm is 5600-6000, I only achieve 5200-5400 with the 10 1/4" by 8"Pitch quick silver prop I have. … read more
Jason Forsberg
Jason Forsberg
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Vocational, Technical or Trade Scho
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I have a 1998 225 EFI 2 stroke outboared..I cannot get 4500
I have a 1998 225 EFI 2 stroke outboared..I cannot get 4500 rpm and when I trim the motor up, it will go to 4900 rpm, thats it..When I first go full throttle it goes to 3000 rpm..After a little bit it… read more
Mechman45
Mechman45
Vocational, Technical or Trade School
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I have a 24 ft pontoon boat with a 2005 90 hp outboard ,the
I have a 24 ft pontoon boat with a 2005 90 hp outboard ,the engine cavitates alot some times at 3500 rpm somtimes higher ,cruising at 3000 to 3500 for no reason at all the rpms start climbing. the eng… read more
Dominick
Dominick
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Vocational, Technical or Trade Scho
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I have a 21ft pontoon boat with a 70 hp merc ob. the prop that
I have a 21ft pontoon boat with a 70 hp merc ob. the prop that was on it was 13 3/4X15. at 3800rpm it cavitates bad. I tried a 13 1/4X 17 and can only get 3800 rpm out of a max 5000. Igot the boat fro… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
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I have an 88 Bayliner Capri 1500, 15.5 ft bowrider, with a
88 Bayliner Capri 1500, 15.5 ft bowrider, with a Force 50 hp outboard. It has a Michigan 10 3/8,#072131, 11 1/2 pitch aluminum prop. I need to get a new prop, will use the 11 1/2 pitch as a spare, wha… read more
bluestreak21
bluestreak21
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Vocational, Technical or Trade Scho
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Meet the Experts:

Dominick

Dominick

Marine Mechanic

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25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

Ted G.

Ted G.

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40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness

John White

John White

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Jason

Jason

Marine Mechanic

17,310 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,264 satisfied customers

40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

Jeff G.

Jeff G.

Marine Mechanic

4,729 satisfied customers

42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance

Captain Dave

Captain Dave

Marine Mechanic

2,672 satisfied customers

USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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