Boat

Have Boat Questions? Ask a Boat Repair Expert.

Ask an Expert,
Get an Answer ASAP!

I have Tohatsu 6 hp 4 stroke. Doesn't seem to rev very high.

Customer Question
I have Tohatsu 6...

I have Tohatsu 6 hp 4 stroke. Doesn't seem to rev very high. Do I need to adjust high speed jet on carb?

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so the Marine Mechanic can help you best.

Thanks,

Mechanic's Assistant: Is there anything else important you think the Marine Mechanic should know?

Hoe do you adjust carb?

Submitted: 11 months ago.Category: Boat
Show More
Show Less
Ask Your Own Boat Question
Answered in 19 minutes by:
9/9/2017
Marine Mechanic: Matthew John, Marine Mechanic replied 11 months ago
Matthew John
Matthew John, Marine Mechanic
Category: Boat
Satisfied Customers: 69
Experience: Marine Technician, Certified in MERCRUISER AND MERCURY OUTBOARDS (Current), EVINRUDE, SUZUKI, YAMAHA, HONDA.
Verified

Hi my name is***** to Just Answer ! I will be assisting you.

Ask Your Own Boat Question
Customer reply replied 11 months ago
I'm waiting to hear from you
Customer reply replied 11 months ago
Engine does not rev very high.
Marine Mechanic: Matthew John, Marine Mechanic replied 11 months ago

Hey ya, just a few questions to get started...

Are you operating the engine in any special conditions? e.g. Cold, freezing, or high altitude?

Are you able to visually see if the throttle valve at the throttle body/ carb opens to the full position? (Horizontal).

Can you see if the engine runs better on the remote tank (If Optional) if not, see if it runs better on a FULL tank.

Lastly... You can adjust the IDLE mixture but there is no adjustment for high speed. Make sure engine is not running hot or too cool. Check oil level and there is no RED warning light. MOSTLY for your symptoms tho is to try another fuel supply.

Regards,

Matt

Ask Your Own Boat Question
Customer reply replied 11 months ago
It's new gas and a remote tank.
Customer reply replied 11 months ago
Not high altitude or cold
Marine Mechanic: Matthew John, Marine Mechanic replied 11 months ago

There is an idle mixture screw behind an Aluminium Welsh Plug that you can delicately remove to access, but your problem is higher RPM, so I will be thinking of a couple of of other things first

Ask Your Own Boat Question
Customer reply replied 11 months ago
Idling is fine,what rare you thinking
?
Marine Mechanic: Matthew John, Marine Mechanic replied 11 months ago

Hey mate , sorry for the delay!!! If you have ANY suspicion of contamination of fuel, I would go straight to the carburettor, inspect/ replace In-Line Fuel Filter. When Checking the Carb I would put Fine copper electrical wire strand through all the Jet's orfices to clear. AND make sure if you have already gone through all of this already that you, make sure when you put the Carburettor low bowl back on that the BLACK PLUG is in and touching the bottom of the bowl. If you need me to send pics, just send me engine serial number! Thanks!

Regards,

Matt

Ask Your Own Boat Question
Customer reply replied 11 months ago
Matt, please send photos. Model# ***** 6BS Serial 029737XG
Thanks,
Cap
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a marine mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Matthew John Your Own Question
Matthew John
Matthew John
Matthew John, Marine Mechanic
Category: Boat
Satisfied Customers: 69
69 Satisfied Customers
Experience: Marine Technician, Certified in MERCRUISER AND MERCURY OUTBOARDS (Current), EVINRUDE, SUZUKI, YAMAHA, HONDA.

Matthew John is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

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

Ted G.

Ted G.

Rigger, Diagnostician

704 satisfied customers

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

John White

John White

Marine Mechanic

306 satisfied customers

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

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

< Previous | Next >

Related Boat Questions
My 30hp outboard bogs out when i try to give it some
my 30hp outboard bogs out when i try to give it some throttle. i have to pull the choke out partially to get it to plain i have cleaned out the fuel tank, carbuerator replaced some perished fuel lines… read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
8 hp tohatsu 4 stroke idles only. Will not run long at high
8 hp tohatsu 4 stroke idles only. Will not run long at high rpms under load more than 5 minutes before it shuts down to idle. New plugs. the red light did not come on under load when it shut down to i… read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
2010 Tohatsu 9.8 4-stroke stalls at idle or low speed; fine
2010 Tohatsu 9.8 4-stroke stalls at idle or low speed; fine when underway of full throttle. Checked out low speed jets in carb, looked clear, replaced needle and gaskets any way. Using prem gas with S… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
30 HP Yamaha 4 stroke 2002 "S"wont take throttle above 1500
30 HP Yamaha 4 stroke 2002 "S"wont take throttle above 1500 rpm. Cleaned intermediate jets and high speed jets which had varnish restrictions replaced base plate o rings and needle valves.At full thro… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
1998 suzuki v twin 4 stroke 25 hp outboard starts to missfire
1998 suzuki v twin 4 stroke 25 hp outboard starts to missfire at about half throttle and revs will not increase, sound like running on one cylinder. Sometimes when warm second cylinder seems to fire a… read more
Abiorca
Abiorca
Proprietor
Vocational, Technical or Trade Scho
1,768 satisfied customers
Ive only had moderate success with just answer. I love
I've only had moderate success with 'just answer'. I love to pay when you solve my problem. I don't pay if you don't; so if this is an issue please don't respond. I have a new (run less than 100 hrs) … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
Since you did me well last time here we go again. 1999 Mercury
Since you did me well last time here we go again. 1999 Mercury 15 hp 2 stroke electric. History, sat in barn for ten years with gas in carb. Almost no running time on this motor. Have used spray carb … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
2002 Tohatsu 25 hp 4-stroke. Just replaced head, valve job,
2002 Tohatsu 25 hp 4-stroke. Just replaced head, valve job, new plugs. Engine starts and idles fine but backfires at full throttle and loses power. I took the carbs off to clean them and they dont loo… read more
James
James
Certified Marine Mechanic
Vocational, Technical or Trade Scho
4,094 satisfied customers
Mercury 6 hp 2 stroke has low rpm under load. Will rev up
Mercury 6 hp 2 stroke has low rpm under load. Will rev up in neutral. Tried new fuel tank. Cleaned spark plugs.… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade Scho
17,310 satisfied customers
I have a 1963 JOHNSON 2 STROKE I JUST BOUGHT. iT HASNT RUN
I have a 1963 JOHNSON 2 STROKE I JUST BOUGHT. iT HASN'T RUN FOR 2 YEARS I TOOK IT OUT AND IT STARTS BUT DOESN'T WANT TO GO FULL SPEED.IT BOUGS DOWN WHEN YOU REV IT UP.i WAS WONDERING IF ANYONE HAS ANY… read more
Whitecap36
Whitecap36
Service Manager/Technician
Vocational, Technical or Trade Scho
1,476 satisfied customers
Honda bf2d 1 st I am a mercury mechanic with 25 years exp.
1 st I am a mercury mechanic with 25 years exp. I can do book time or less every time on most carb clean/ rebuild jobs. I just got dumped on me 3 bf2d hondas with e10 jelly in carbs. one had to go now… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
6hp tohatsu 4 stroke, runs awful, only starts with choke on,
6hp tohatsu 4 stroke, runs awful, only starts with choke on, hot or cold. Revs out high and then stalls. Fuel is new, treated with startron, vented properly - seems like a carb problem. any suggestion… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I have a 1984 6 cyl 2 stroke 90 HP Mariner O/B ELPT. I just
I have a 1984 6 cyl 2 stroke 90 HP Mariner O/B ELPT. I just started it (in the driveway) and is hasn't been run for about 1 yr. It seems to be idling very fast and when I put it into gear it grinds be… read more
Jeff G.
Jeff G.
Marine Mechanic
Vocational, Technical or Trade Scho
4,729 satisfied customers
I have recently bought a used 3.5hp Tohatsu 4-stroke outboard.When
I have recently bought a used 3.5hp Tohatsu 4-stroke outboard. When the engine starts it appears to run OK. As the engine accelerates its still ok but as you reach the high mid-high end range the engi… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,264 satisfied customers
I have a 10 hp 2 stroke mariner outboard 04/05 the engine ticks
I have a 10 hp 2 stroke mariner outboard 04/05 the engine ticks over nicely sounds good but when I put it in gear and increase the revs the revs I start getting a miss fire which I call popping when I… read more
shane j forrest
shane j forrest
Vocational, Technical or Trade Scho
270 satisfied customers
Where is the high jet screw adjustment located on the mercury
Where is the high jet screw adjustment located on the mercury mariner 2 strokes from 1985? The mothor has two carbs, do you need to adjust the high jet on both carbs? Thanks P… read more
capt ron 1959
capt ron 1959
Owner/Marine Mechanic
Vocational, Technical or Trade Scho
348 satisfied customers
9.8 hp 2 stroke motor wont idle or run at low speed without
9.8 hp 2 stroke motor wont idle or run at low speed without choke. starts easily and runs fine at high speed. carb is super clean.… read more
Master Tech
Master Tech
Service Manager/Technician
Vocational, Technical or Trade Scho
1,167 satisfied customers
Ive a 2006 5hp 4 stroke Mercury outboard (looks like a rebadged
I've a 2006 5hp 4 stroke Mercury outboard (looks like a rebadged tohatsu) and is as far as i can tell identical to the 6hp Mercury engine. How do i release the extra Hp in hiding the 5hp engine?… read more
Abiorca
Abiorca
Proprietor
Vocational, Technical or Trade Scho
1,768 satisfied customers
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.

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.

Show MoreShow Less

Ask Your Question

x