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I have gibson 30,, with 90 sterndrive, I have a prop on it
I have gibson 30,, with dana 90 sterndrive, I have a prop on it but is wrong one, it bogs down and will go over 2500 rpm. I found a prop that was suppose to be right pitch but it was a left hand one a… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
My Merc 150hp Optimax shifts very hard from neutral to
My Merc 150hp Optimax shifts very hard from neutral to forward/reverse making loud gear grinding noise. My previous mechanic said it was normal and to just slam it into gear. I think the rpm is to hig… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
Hello, I have a 2000 Mercury 115 2-stroke on an 18ft boat.
Hello, I have a 2000 Mercury 115 2-stroke on an 18ft boat. I recently drove over some rocks and damaged my propeller. The old propeller was 19 pitch and I was only reaching 4200 rpm with it, so when I… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
Mercury 150 4 stroke: why am i getting a lot of exhaust gas
why am i getting a lot of exhaust gas from the front of my prop (between the prop and gear housing) when at idle? cant tell when travelling New 150 hp 4 styroke merc… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
I have an old 135 hp mercury outboard. When I throttle up
I have an old 135 hp mercury outboard. When I throttle up the engine appears to jump - it seems like the gears are jumping - at less than 1400 rpm this does not happen - would this be a shear pin prob… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
rebuilt 260 hp engine installed in 1972 grew [merc] tried 4
rebuilt 260 hp engine installed in 1972 grew [merc] tried 4 props last being 23 pitch alum rpm 5500 should be max 4800 mechanic suggests 23 pitch ss local propellar guy provided 25 and 27 pitch al and… read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
I was running my Honda BF135 outboard just above idle when
I was running my Honda BF135 outboard just above idle when I hit a rock. Everything seems fine when I am in gear and running, but there is a louder whine when idling. Any ideas what to look for?… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
My two stroke 50 hp Merc outboard starts fine, idles fine,
My two stroke 50 hp Merc outboard starts fine, idles fine, runs fine but when it returns to neutral the rpms increase to around 1300 or 1400. How to correct this?… read more
James
James
Marine Mechanic
Vocational, Technical or Trade Scho
4,111 satisfied customers
I just purchased a used [obviously] 1976 Mercury 150 hp straight
I just purchased a used [obviously] 1976 Mercury 150 hp straight six. Everything runs fine, but I am wondering if there are other gear ratios available for this engine rather than the 2:1 that is in i… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
have a 60 hp 2 strke run s ok at low speed but when try to
have a 60 hp 2 strke run s ok at low speed but when try to plane runs but seems to be in neutral trying to engage . does engage sometimes then ok., think could be a fuel starving problem rgds jim… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
I have a 2455 Bayliner w/5L Merc & OMC drive. When I try to
I have a 2455 Bayliner w/5L Merc & OMC drive. When I try to increase speed to get on plane, my engine revs increase as if in neutral and it appears the prop is just not working at higher revs - seems … read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
1,556 satisfied customers
I have 8v92TA s in my boat. They were just overhauled and now
I have 8v92TA s in my boat. They were just overhauled and now the maximum rpms are 200 less than they should be. Could it be an injector problem even though the mechanic tells me they are all working?… read more
Diesel Boat Doc
Diesel Boat Doc
High School or GED
120 satisfied customers
Boat gets into gear but adding power above 1000 rpm and engine
Boat gets into gear but adding power above 1000 rpm and engine will spin faster but prop does not. Prior to this we had been running fine for about 1hr, then while pulling a tube and doing a few aggre… read more
James
James
Marine Mechanic
Vocational, Technical or Trade Scho
4,111 satisfied customers
Boat owner hit a rock (replaced prop) and now the 150 HP Merc
Boat owner hit a rock (replaced prop) and now the 150 HP Merc motor idles, but starts to knock when given gas and does not have power to plane. The motor is on 17 ft Fiverform boaut.… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
Have a 1986 75 hp merc starts and idles fine works good in
Have a 1986 75 hp merc starts and idles fine works good in reverse, but when you shift into forward it dies, will start right back up… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,730 satisfied customers
I am thinking of buying a used boat with 07 90 hp merc. when
I am thinking of buying a used boat with 07 90 hp merc. when in neutral, I turn the prop by hand and feel a small resistance every turn at one point while rotating. It will not spin freely, but stops … read more
shane j forrest
shane j forrest
Vocational, Technical or Trade Scho
270 satisfied customers
ingine runs but wont go past 5 mph. i took it out for a spin
ingine runs but wont go past 5 mph. i took it out for a spin and got stuck in shallow water but managed to get out but not before the motor shut off. when i started it again it only went 5mph and woul… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
hi,i bought a 1988 bayliner trophy 21 ft. it had a 4.3 from
hi,i bought a 1988 bayliner trophy 21 ft. it had a 4.3 from fact. a 5.7 was put in 2004, the leg had to be rebuilt in 2006, was this from to much torque from the 5.7 or is it the same leg as the 4.3?… read more
Dominick
Dominick
Marine Mechanic
Vocational, Technical or Trade Scho
1,009 satisfied customers
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Meet the Experts:

Ted G.

Ted G.

Rigger, Diagnostician

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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

18,955 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,406 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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