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I just took a trade on a 1987 34 Grand Sport. When I pulled
Hi I just took a trade on a 1987 34 Grand Sport. When I pulled the boat for bottom service I noticed two different props 1 15x17 and 1 21x17. My question is what is the factory prop size for this boat… read more
K. Kergan
K. Kergan
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Vocational, Technical or Trade Scho
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I have a 2006 searay with 6.2 mpi The port motor only comes
I have a 2006 searay with 6.2 mpi The port motor only comes up to 4500 rpm Throttle feels dead compared to starboard which revs to 5000 rpm and is Much stronger. Just had a valve job and head gasket r… read more
Noel Schembri
Noel Schembri
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Hi, I just bought a boat with a 2006 Mercury 40 hp efi.
Hi, I just bought a boat with a 2006 Mercury 40 hp efi. The motor idles and runs great, but it won't rev past about 4000 rpms. Can I adjust the screw that goes into the throttle linkage, it appears th… read more
Charles
Charles
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so i have s 1997 Johnson Fisht 150 Fast Strike. My motor starts
so i have s 1997 Johnson Fisht 150 Fast Strike. My motor starts fine and idles fine but when i run wide open im only at 4000 rpm. stock prop but i ordered a 21 pitch stainless. what would cause this? … read more
Tan
Tan
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I have a 2007 262 cobalt boat. I want to increase the horsepower
I have a 2007 262 cobalt boat. I want to increase the horsepower or speed of the boat, what can I do… read more
Jason
Jason
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I have a 2002 Glastron 205GX boat. My problem is at 40 mph
I have a 2002 Glastron 205GX boat. My problem is at 40 mph and 4000 rpm I can only trim it up 1/4 before it begins to cavitate. Have tried a 14.5 x19 and a 14.3x21 prop.… read more
Tech Tom
Tech Tom
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My 8.1 mercruiser is over reving at full throttle. It revs
My 8.1 mercruiser is over reving at full throttle. It revs to about 5100 rpms then beeps and then seems to hit some sort of a rev limiter or limp mode. I checked the prop and it is the recommended pro… read more
Tyler
Tyler
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What props do you suggest for top speed/fuel economy for my
What props do you suggest for top speed/fuel economy for my '95 Mercruiser 5.7 Alpha One driving a 24' '71 Fiberform cabin cruiser (fairly heavy glass hull)?… read more
Ted G.
Ted G.
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Vocational, Technical or Trade Scho
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bayliner ciera: james i ve install a 454 mpi in my 2855 bayliner
james i 've install a 454 mpi in my 2855 bayliner ,the prop i am running is a 18 inch 4 blade aluminum ,at 26 mph the motor revs at 4000 rpm ,is that a little high, and do you have a sugestion to what… read more
James
James
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I have a 2002 Merc 305 EFI .... I need to replace the lower
I have a 2002 Merc 305 EFI .... I need to replace the lower unit (Alpha 1 Gen 2).....(slid off the boat trailer and cracked) OUCH! tried welding but still leaks oil ..... The sticker on the side of th… read more
Jason
Jason
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Vocational, Technical or Trade School
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My daughter is racing a monohull boat fitted with a suzukiDT65
My daughter is racing a monohull boat fitted with a suzukiDT65 (1985). It appears to rev well in a dry start but in the water it as very poor acceleration and top end speed. I have cleaned the carbera… read more
Captain Dave
Captain Dave
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Master's Degree
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I bought a welcraft and the previous owner had a 5.0 mpi compleat
I bought a welcraft and the previous owner had a 5.0 mpi compleat engine installed and im wondering can i have my ecm reprogramed to higher rpm range? If so who can do it ? thanks Joe… read more
James
James
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Vocational, Technical or Trade Scho
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I have a Yanmar YM30 diesel in my newly-acquired 32 ft sailboat.
I have a Yanmar YM30 diesel in my newly-acquired 32 ft sailboat. Previous owner had just installed this "nearly-new" engine with FWC and V-drive, all salvaged from another boat. (original installation… read more
Captain George
Captain George
Bachelor's Degree
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I have a mercruiser 5.0 engine with a bravo ll outdrive. Which
I have a mercruiser 5.0 engine with a bravo ll outdrive. Which prop will give me more MPH, is it 17 3/4 X 21 or 17 3/4 X 23. Waiting for your answer.… read more
Kenny
Kenny
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I have a 16ft open aluminum boat with a 40 hp Johnson on it.What
I have a 16ft open aluminum boat with a 40 hp Johnson on it.What pitch of prop would you recommend.… read more
Captain Dave
Captain Dave
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Carver 350 Mariner. 2001. only 195 hrs. Momentary top RPM 4,300.
Carver 350 Mariner. 2001. only 195 hrs. Momentary top RPM 4,300. Cruise at 3,800 RPM getting 16 knots. Only 0.5 mpg?? Hull is clean. At 105 hrs: starboard engine with burn valve, pulverized........new… read more
mercmastertech
mercmastertech
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I have a 1997 33 searay. twin 454 mpi 340 hp. The starboard
I have a 1997 33 searay. twin 454 mpi 340 hp. The starboard tops out at 3200 rpms and with the computer from merc crusier shows the throttlebody is fully open. The port has all kinds of power to spare… read more
Mechman45
Mechman45
Vocational, Technical or Trade School
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I recently bought a new Yahama 2.5 outboard motor. On my maiden
I recently bought a new Yahama 2.5 outboard motor. On my maiden trip in the FloridaKeys a month ago, I discovered that the throttle did not accelerate when wide open..It ran at the same speed at quart… read more
orcamarine
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Meet the Experts:

Ted G.

Ted G.

Rigger, Diagnostician

3,332 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

24,091 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

Noel Schembri

Noel Schembri

Marine Mechanic

2,759 satisfied customers

Advanced technical diploma

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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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