Small Engine

Small Engine Troubleshooting Problems? Ask a Mechanic Now.

Ask an Expert,
Get an Answer ASAP!

I have a 450 series mower which won't rev, and emits faint…

Customer Question
I have a 450...

I have a 450 series mower which won't rev, and emits faint black smoke (rich mixture suspected, but no apparent mixture adjustment) New plug and diaphragms fitted, compression excellent, fuel tank flushed. Any suggestions please.

Mechanic's Assistant: What's the make and model of the mower? And can you guesstimate how old it is?

Briggs and Stratton serial no 11 1110 51 46625 sorry! Age don't know - a "gift" looks clean - say 3-5 yrs?

Mechanic's Assistant: Do you plan on doing the work yourself?

Yes - done

Mechanic's Assistant: Anything else we should know to help you best?

I am curious that there is no apparent mixture control and don't understand this process. I believe that I have adjusted the speed control correctly. The air condition filter has been replaced, but the performance is the same with the filter removed

Submitted: 11 months ago.Category: Small Engine
Show More
Show Less
Ask Your Own Small Engine Question
Customer reply replied 11 months ago
As we are waiting, I have approved the $25, but I do not wish to continue on a $25 per month basis - happy to pay that for a one-off advice but please terminate any on-going charges
Answered in 3 hours by:
9/16/2017
Technician: Donald, Small Engine Technician replied 11 months ago
Donald
Donald, Small Engine Technician
Category: Small Engine
Satisfied Customers: 2,603
Experience: I have 25+ years of experience repairing 2 & 4 cycle engines
Verified

Hello. Thank you for choosing Just Answer. My name is***** will be happy to assist you.

Ask Your Own Small Engine Question
Technician: Donald, Small Engine Technician replied 11 months ago

Based upon what you have already covered, I believe your carburetor is at fault.

Ask Your Own Small Engine Question
Technician: Donald, Small Engine Technician replied 11 months ago

Have you checked your flywheel key to see if it is partially sheared?

Ask Your Own Small Engine Question
Technician: Donald, Small Engine Technician replied 11 months ago

We can continue from here.

Ask Your Own Small Engine Question
Customer reply replied 11 months ago
I will do that, although the flywheel is firm on its shaft
Customer reply replied 11 months ago
Sorry - I'm in Australia!
Customer reply replied 11 months ago
The carburettor has no visible means of adjusting the mixture, ?how is this done - is it a fixed function due to jet size and venturi diameter only?
Technician: Donald, Small Engine Technician replied 11 months ago

Is your carburetor mounted to your fuel tank?

Ask Your Own Small Engine Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a technicianLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Curtis B. Your Own Question
Curtis B.
Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 15,342
15,342 Satisfied Customers
Experience: have worked on and around most engine models for 35 yrs./Polaris ATV expert

Curtis B. 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:

You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future.

JimmyBagley, IA

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

< Previous | Next >

Meet the Experts:

Curtis B.

Curtis B.

Technician

15,342 satisfied customers

have worked on and around most engine models for 35 yrs./Polaris ATV expert

Rick

Rick

Factory Authorized Trainer

4,218 satisfied customers

Outdoor Power Equipment technical trainer since 1990, covering eight states.

Jon K.

Jon K.

Small Engine Diagnostic Expert

2,995 satisfied customers

Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines

James W

James W

Small Engine Troubleshooting Expert

2,986 satisfied customers

7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years

Vince O.

Vince O.

Small Engine Technician

2,927 satisfied customers

Over 30 years experience repairing lawn and garden equipment. Chainsaws, mowers,blowers and trimmers

Wayne

Wayne

Engine Rebuilder

2,041 satisfied customers

many years on egine rebuilding, lawn mower,roto tiller,Truck,and small engines

RUSS

RUSS

SERVICE TECHNICIAN

1,723 satisfied customers

28 YEAR SERVICE TECHNICIAN

< Previous | Next >

Related Small Engine Questions
I have an old briggs and Stratton mower. I have cleaned
I have an old briggs and Stratton mower. I have cleaned carby , new diaphragm, starts first pull , as soon as I connect air filter hose motor dies. can you suggest where to go next… read more
Curtis B.
Curtis B.
Technician
Associate Degree
15,342 satisfied customers
Pearl, my name is ***** ***** i have a 2011 weedeater 22"
hi pearl, my name is ***** ***** i have a 2011 weedeater 22" lawnmower with a briggs and stratton engine series 550 mod:10T802, type1253 B1, code 1M011255. and it has a problem flooding (black exhaust… read more
Curtis B.
Curtis B.
Technician
Associate Degree
15,342 satisfied customers
I have a 4.5 hp 125 mL Briggs & Stratton engine that has never
I have a 4.5 hp 125 mL Briggs & Stratton engine that has never been use is. It is a 2004 model it will fire up when you put quick start on the filter but it will not continue to run I don't Think is g… read more
Curtis B.
Curtis B.
Technician
Associate Degree
15,342 satisfied customers
I have a VICTA Motor Mower, fitted witha 550EX, 140cc, 4
Hello there, I have a VICTA Motor Mower, fitted witha 550EX, 140cc, 4 stroke, Briggs & Stratton OHV motor. It was purchased recently from a Bunnings Store. I have used it about 6 times and had excelle… read more
Donald
Donald
Small Engine Technician
2,603 satisfied customers
450 series 148cc the mower was stored on its front end facing
450 series 148cc the mower was stored on it's front end facing down not flat took it out it tries to start after Im prime but stops can you help… read more
James W
James W
Small Engine Troubleshooting Expert
Bachelor's Degree
2,986 satisfied customers
I have a Briggs and Stratton 500 Series 5.5 HP motor that,
I have a Briggs and Stratton 500 Series 5.5 HP motor that, until recently ran very well. It's mounted on a MTD tiller and is about 3 yrs. old. The motor starts fine, but the engine is gettiing too muc… read more
J.R.
J.R.
Vocational, Technical or Trade Scho
7,173 satisfied customers
I have a 20 inch Murry mower with a 4.5 Briggs and Stratton
I have a 20 inch Murry mower with a 4.5 Briggs and Stratton engine. It does not have a manual rpm cable. It is running gought... it does not run smooth.... it appears to be running very rich. I have c… read more
wheelhrs
wheelhrs
Vocational, Technical or Trade Scho
424 satisfied customers
My four month old model series 410 lawn mower with a briggs/stratton
My four month old model series 410 lawn mower with a briggs/stratton motor all of a sudden started running very roughly. It seems like it is way too rich and the plug gets fouled. As a result I am als… read more
Dr. Carburetor
Dr. Carburetor
Bachelor's Degree
13 satisfied customers
Craftsmans 18 hp Briggs&Stratton engine. Mower is 7 yrs old.
Craftsmans 18 hp Briggs&Stratton engine. Mower is 7 yrs old. Will start fine but will cutoff after 5-10 min. All filters, oil, spk plug has been changed out. Sears repair has been out twice and can ne… read more
Vince O.
Vince O.
Small Engine Technician
High School or GED
2,927 satisfied customers
My 1 yr old Craftsman lawn mower has a 550 series Briggs motor.
My 1 yr old Craftsman lawn mower has a 550 series Briggs motor. It has started to surge. It revs up and down like the govenor is constantly engauging. I've cleaned the air filter and cleaned and re-ga… read more
Jon K.
Jon K.
Small Engine Diagnostic Expert
Some College, military training,
2,995 satisfied customers
looking for a grass box for a briggs stratton petrol lawnmower
looking for a grass box for a briggs stratton petrol lawnmower ( model no. sov46d ) 450 series, ( sovereign ) yr 2009 . please confirm… read more
J.R.
J.R.
Vocational, Technical or Trade Scho
7,173 satisfied customers
My lawn mower has a Briggs and Stratton 450 Series engine,
My lawn mower has a Briggs and Stratton 450 Series engine, 148 ccs. It looks like the rotation speed of this device is too slow. This motor is not equipped with throttle control. How can I increase RP… read more
J.R.
J.R.
Vocational, Technical or Trade Scho
7,173 satisfied customers
i have a briggs and stratton push mowere 500 series and it
i have a briggs and stratton push mowere 500 series and it run but wont stay running after 2 seconds when started could this be the diaphragm and gasket i got a new plug,filter,new gas. the mower is b… read more
J.R.
J.R.
Vocational, Technical or Trade Scho
7,173 satisfied customers
I have a Briggs and Stratton 3.75 HP lawnmower engine that
I have a Briggs and Stratton 3.75 HP lawnmower engine that I abused over the winter, leaving gas in the tank. It wouldn't start this spring until I replaced the gas. It was running very rich (some bla… read more
PK.
PK.
Owner
High School or GED
943 satisfied customers
I have briggs stratton engine #92508-0678-01 with diaphragm
I have briggs stratton engine #92508-0678-01 with diaphragm carb that is running rich, gasket has been changed, tank and carb cleaned… read more
Pat Brooks
Pat Brooks
Vocational, Technical or Trade Scho
42 satisfied customers
MY BRIGGS AND STRATTON 4 HORSE MOWER RUNS TOO RICH. THERE
MY BRIGGS AND STRATTON 4 HORSE MOWER RUNS TOO RICH. THERE IS NO ADJUSTMENT TO LEAN IT OUT. PLUG WAS CHANGED AND I CLEANED THE AIR FILTER SPONG. IT STILL RUNS AND GAGS LIKE IT IS TOO RICH...I EVEN TRYE… read more
PK.
PK.
Owner
High School or GED
943 satisfied customers
I have a Briggs and Stratton 450 Series Lawn Mower, 148 ccs
I have a Briggs and Stratton 450 Series Lawn Mower, 148 ccs and would like to know how to adjust or control the slow running of the engine. There seems to be no slow running screw only two very weak s… read more
The Small Engine Doctor
The Small Engine Doctor
One year, Automotive Tech toward as
46 satisfied customers
I have a new Poulan lawn mower with a Briggs and ...
I have a new Poulan lawn mower with a Briggs and Stratton motor. The engine does not seem to run at full power and the spark plug is very black with carbon when I take it out. I assume I need to adjus… read more
Engine newity
Engine newity
Associate Degree
8 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