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At 3/4 throttle I am losing thrust and RPMs go up below 5k
at 3/4 throttle I am losing thrust and RPMs go up below 5k rpm boat goes fine and has not issues … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
23,080 satisfied customers
Not sure I have no mechanical issues. But my propeller I
Not sure I have no mechanical issues. But my propeller I have a four bladed Spitfire 13 x 15. My boat key is 5200 RPM for a proximately 34 35 mph. But the wear on the prop I never had on any boat befo… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
23,080 satisfied customers
Lower unit on Yamaha 150 seems to be slipping, Twin engines.
Twin engines. Increase revs to get on plane. When both engines reach 3000 rpm the left hand rotation engine revs like prop isnt grabbing. Revs increase quickly but prop doesn't grab water … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
23,080 satisfied customers
2010 Yamaha model F25SEHA, VIN 6BPKS - 1008996 Motor rigged
2010 Yamaha model F25SEHA, VIN 6BPKS -(###) ###-#### Motor rigged on a 14' aluminum boat, my son uses it to pull a boom - similar to those used to retain oil spills - to reclaim material from an ash p… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
23,080 satisfied customers
I have a 15 hp 2002 Mercury two cycle outboard experiencing
I have a 15 hp 2002 Mercury two cycle outboard experiencing cavitation when just about to get on plane new prop still exhibits cavitation or reving of engine RPM. Have marked shaft prop and locking nu… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
23,080 satisfied customers
I have a 1997 225 EFI My boat is having trouble getting
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Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
2,678 satisfied customers
I have a 84 mercury 40 hp two stroke outboard. I recently
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Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
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Im prop shopping and need some good answers on buying a spare
I'm prop shopping and need some good answers on buying a spare and maybe a replacement main prop. I recently bought a used 2003 Alumacraft Tournament PRO 175 CS. It's a single console deep V, 17' 11” … read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
23,080 satisfied customers
I have a 2005 Yamaha 60hp 4 stroke....when I put it in reverse
I have a 2005 Yamaha 60hp 4 stroke....when I put it in reverse it will go fine until I really give it some gas......once I give it a decent amount of throttle the engine will be wound up but the prop … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
first time boat owner. I replaced the old prop 13x19 with new
first time boat owner. I replaced the old prop 13x19 with new and I am now having problems planing out. 1994 force 120hp is fine when driving slow but when planing out the rpms get really high and fee… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,409 satisfied customers
Mercury I have a 2001 Mercury 200 hp EFI. Starts and runs
I have a 2001 Mercury 200 hp EFI. Starts and runs fine, When running above 5300 rpm the motor loses power but does not die. I can tilt back down and plane and run again. i changed the prop to a four b… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have a Fisher 200 Freedom Fish pontoon boat with a Merc 50hp,
I have a Fisher 200 Freedom Fish pontoon boat with a Merc 50hp, 4cyl, 4 stroke outboard. Both are 1996 vintage. I need a new prop. The current prop is 10.5" dia with about a 11" pitch. It has always e… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
60 hp 2006 ELPTEFI Propeller slipped and only 12MPH instead
60 hp 2006 ELPTEFI' Propeller slipped and only 12MPH instead of 30 at 6000rpm. New identical prop. !4 mph now at 6000rpm. Different problem? 17 ft maycraft fiberglass center console.… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
Hello, I have a 28 suntracker pontoon boat with a Mercruiser
Hello, I have a 28' suntracker pontoon boat with a Mercruiser 3.0 w/ alpha 1 outdrive 2.00 raito. I just purchased this boat and it had 40 +/- hrs on it. The problem it has is anything over 3200rpm an… read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
I have a 150 hp mercury on the back of a tri-pontoon. Sometimes
I have a 150 hp mercury on the back of a tri-pontoon. Sometimes under acceleration about half way it sounds like it runs out of water and starts increasing in RPM, but not power.… read more
davesoutboard
davesoutboard
owner
Associate Degree
1,570 satisfied customers
About two months ago I wrote the question my 50 hp Mercury
About two months ago I wrote the question my 50 hp Mercury 2007 Pontoon rpm's jumping wildly when boat was driven. Problem you awnsered "Hub Slip". I replaced Prop ran great no problems. Now today I r… read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
I need directions to winterize my Mercruiser 4.0 I/O and the
I need directions to winterize my Mercruiser 4.0 I/O and the manual was lost in a fire. Can you help?… read more
ROCKET
ROCKET
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Vocational, Technical or Trade Scho
426 satisfied customers
when under power at steady rpm the engine will rev like the ...
when under power at steady rpm the engine will rev like the rubber bushing in the prop is slipping but after buying a new prop the problem persists. the boat is a 20'' pontoon with a 40 hp Force.… read more
Ted G.
Ted G.
Rigger, Diagnostician
Vocational, Technical or Trade Scho
2,678 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

Rigger, Diagnostician

2,678 satisfied customers

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

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

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

John White

John White

Marine Mechanic

306 satisfied customers

11 years experience working on outboards, inboards, sterndrives & pwcs

Jason

Jason

Marine Mechanic

23,080 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,409 satisfied customers

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

Jeff G.

Jeff G.

Marine Mechanic

4,730 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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