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I have a 2001 Searay w/ 4.3 L mercruiser stern drive
Hello. I have a 2001 Searay w/ 4.3 L mercruiser stern drive Alpha I w/ Thunderbolt V ignition system. Recently rebuilt motor due to improper winterizing, cracked block. I ordered short block marine en… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I have a boat with a 1975 mercury 650 65hp 3 cycl. Motor. I
I have a boat with a 1975 mercury 650 65hp 3 cycl. Motor. I have recently rebuilt the carbs changed the fuel lines spark plugs and fuel filter. I'm having issues with the idling. When in water the idl… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
I have a 1999 7.4L MEI and I am trying to set the timing.
I have a 1999 7.4L MEI and I am trying to set the timing. I found on line that you can use a paper clip to jump terminals A & B on the (DLC) Data Link Connecter as this is what the Mercruiser Timing T… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
1994 4.3LX thunderbolt IV. just cleaned up the carburetor and
1994 4.3LX thunderbolt IV. just cleaned up the carburetor and replaced the fuel/water filter. The engine started right up but stays at about 2k RPM the throttle is at idle. I have revved it up to 3k a… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I have a maxum 2300 sc 5.7 merc alpha 1 running a 14x19 prop
I have a maxum 2300 sc 5.7 merc alpha 1 running a 14x19 prop at wot I only get to 3800 rpms. I have changed plugs, wires , cap and rotor. fuel filter and no joy. I checked the gear ratio 1.5 to 1 and … read more
orcamarine
orcamarine
Proprietor
Vocational, Technical or Trade Scho
7 satisfied customers
I have a 1986 formula 242ls with a new mercruiser 275hp. from
I have a 1986 formula 242ls with a new mercruiser 275hp. from first mate . alpha with a 15 x 16degree prop. the boat will not go aver 3000 rpm. i have thunderbolt iv and it is working properly engine … read more
K. Kergan
K. Kergan
Inboard/Outboard Mechanic
Vocational, Technical or Trade Scho
1,031 satisfied customers
i have an 86 bayliner capri with a 4 cylinder volvo. it is
i have an 86 bayliner capri with a 4 cylinder volvo. it is extremely hard to start. always wants to die. once it is warmed up there are no problems… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
My 1990 7.4L Mercruiser engine is fine at 3500 RPM and below.
My 1990 7.4L Mercruiser engine is fine at 3500 RPM and below. Above 3500 RPM it surges. What is the problem?… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
Tan, You helped me with my amberjack a year ago and now I
Tan, You helped me with my amberjack a year ago and now I have a problem with my 2005 searay 185 sport. 4.3 mercruiser alpha w thunderbolt ignition, 2 brl carb. The boat starts instantly when cold, bo… read more
Jeremy R.
Jeremy R.
5,362 satisfied customers
I have twin 454 MIE 7.4L MerCruisers in a 1992 Sea Ray 370
I have twin 454 MIE 7.4L MerCruisers in a 1992 Sea Ray 370 Sedan Bridge. Both are original and run great. 1,000 hours each. My starboard engine occassionally stalls at idle either before pulling away … read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I have a 93 boat with a 2 year old 5 litre inboard chev engine.It
I have a 93 boat with a 2 year old 5 litre inboard chev engine.It has a merc outdrive with a 19 pitch prop,no power out of the hole good top end,just put new 45,000 volt coil onstill didnt fix,is it m… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
I have a 1992 merc 115 inline 4 w/oil injection it will idle
I have a 1992 merc 115 inline 4 w/oil injection it will idle all day and it will run wide open all day but going from idle to full speed it sputters along for a long time then it seems to clear out an… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
Hello, I am repairing a 1988 mercruiser MCM 7.4 liter engine
Hello, I am repairing a 1988 mercruiser MCM 7.4 liter engine equiped witha thunderbolt IV ignition and would like to know if there is a correct procedure to time the motor due to the type of ignition.… read more
mercmastertech
mercmastertech
Service Manager, Master technician
Technical School
249 satisfied customers
What is the Correct Procedure to adjust the Timing on a 1999
What is the Correct Procedure to adjust the Timing on a 1999 Mercrusier 5.0 Liter 305 with thunderbolt Ignition?… read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
I have a 5.7 ltr Merc. w/ 2bbl carb. I have hesitation when
I have a 5.7 ltr Merc. w/ 2bbl carb. I have hesitation when advanceing the throttle quickly. To the point where it will stall if I do not pull back to neutral. After running fine @ idle if I shut down… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
1990 4.3L Alpha 1, starts and runs perfect to 36oo RPM then
1990 4.3L Alpha 1, starts and runs perfect to 36oo RPM then pops back through carb slightly , not violently ,labors hard at 38oo RPM , will not pull past 4000 while laboring . Changed plugs ,wires ,co… read more
Mechman45
Mechman45
Vocational, Technical or Trade School
152 satisfied customers
I have a 1973 Evinrude 85, It starts hard warm or cold and
I have a 1973 Evinrude 85, It starts hard warm or cold and runs very rough at all RPM's. I think the carbs are gummed up. Any advise on where to start?… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
79 merc 90hp thunderbolt3 inline6- after sitting for ...
79 merc 90hp thunderbolt3 inline6- after sitting for long periods, will not start, have to pull plugs and put fuel in cylinders to start- after warm will start normally- rebuilt carbs, fuel pump,has n… read more
Captain Dave
Captain Dave
Marine Mechanic
Master's Degree
2,672 satisfied customers
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Jeff G.

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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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