Small Engine

Small Engine Troubleshooting Problems? Ask a Mechanic Now.

Ask an Expert,
Get an Answer ASAP!

This answer was rated:

This question is for a B & S 20 hp TWIN II engine. I just…

This question is for a...
This question is for a B & S 20 hp TWIN II engine. I just install new plugs, ignition coil, and fuel filter to correct some erratic running. Each time I crank the engine, it starts promptly, runs a few seconds and shuts down. I can recrank the engine easily, and it repeats the same run time and shutdown. The engine sounds strong for the few seconds that it is running.

What can I check to troubleshoot this problem?
Show More
Show Less
Ask Your Own Small Engine Question
Answered in 3 minutes by:
6/26/2010
J.R.
J.R., Small Engine Technician
Category: Small Engine
Satisfied Customers: 7,445
Experience: Owner of outdoor power equipment business, repairing all makes and models.
Verified
The problem sounds like a plugged up jet in the carburetor. You did not provide the model numbers off of the engine, but if it is the one I am thinking of there will be a large bolt head on the left side of the carb(as viewed when setting on tractor). Take that bolt out. Under that bolt there will be an allen head bolt recessed back in the carb. That is the main jet. Make sure the hole in that is clear. If cleaning that does not help then you will need to completely disassemble the carburetor and give it a good cleaning.
J.R.
J.R., Small Engine Technician
Category: Small Engine
Satisfied Customers: 7,445
Experience: Owner of outdoor power equipment business, repairing all makes and models.
Verified
J.R. and 87 other Small Engine Specialists are ready to help you
Ask your own question now
Customer reply replied 8 years ago
There was a threaded plug drilled with an orifice behind the bolt head. I ended up having to take the carb off to get the plug back in. I cleaned and blew out the carb. I also installed a screw tightening clamp on the new fuel line to the carb that fit rather loosely with the factory spring clamp. But the important thing is the mower started and ran fine after this work. I'm satisfied with your answer and am happy to OK your payment.
Thank you very much.
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 J.R. Your Own Question
J.R.
J.R.
J.R., Small Engine Technician
Category: Small Engine
Satisfied Customers: 7,445
7,445 Satisfied Customers
Experience: Owner of outdoor power equipment business, repairing all makes and models.

J.R. 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

15,517 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 a 20 some year old 18 h. twin II lawn mower. recently
I have a 20 some year old 18 h. twin II lawn mower. recently it starts up just fine but once I shut it off it will not restart until the next day. It gets gas, has new plugs, air filter, gas filter. T… read more
Curtis B.
Curtis B.
Technician
Associate Degree
15,517 satisfied customers
I have a 2-3 year old Troy-Bilt 2700 psi 7.5 hp (&S)
Hi - I have a 2-3 year old Troy-Bilt 2700 psi 7.5 hp (B&S) pressure washer from Lowes (I've been looking for model #, but can't find it). When using it constantly for about 15-20 minutes, it shuts dow… read more
Curtis B.
Curtis B.
Technician
Associate Degree
15,517 satisfied customers
I have a Troy Bilt Bronco with a Briggs and Stratton engine
I have a Troy Bilt Bronco with a Briggs and Stratton engine that runs fine for a while, but after 20 or 30 minutes of mowing the engine will stutter and shut off. If I let it sit for a while I can get… read more
Curtis B.
Curtis B.
Technician
Associate Degree
15,517 satisfied customers
My Honda GX610 V-Twin has been totally reliable since I installed
My Honda GX610 V-Twin has been totally reliable since I installed it in a Cushman Trackster snow machine about ten years ago. This fall it started easily as usual, but after about one minute of smooth… read more
Curtis B.
Curtis B.
Technician
Associate Degree
15,517 satisfied customers
I have a Gravely 148Z with a 21 hp Kawasaki engine. It will
I have a Gravely 148Z with a 21 hp Kawasaki engine. It will crank but after a few seconds shut down. When cool it may even run a few minutes before shutting down. What is causing that issue?… read more
Curtis B.
Curtis B.
Technician
Associate Degree
15,517 satisfied customers
I have a B&S 22 hp V-twin was having a problem with spark
I have a B&S 22 hp V-twin was having a problem with spark on right side looking from seat. I put a new coil on now getting spark, but if I take the left side plug wire off the engine kills, but will n… read more
Curtis B.
Curtis B.
Technician
Associate Degree
15,517 satisfied customers
20 hp twin gas onan run for 4 to five minutes then shuts
20 hp twin gas onan run for 4 to five minutes then shuts down till it ools off oil is good but it seems to run hot is there a heat sensor or how do I get it to run cooler… read more
Curtis B.
Curtis B.
Technician
Associate Degree
15,517 satisfied customers
I have a Scagg- Modle #stt61A-27ch that runs good for about
I have a Scagg- Modle #stt61A-27ch that runs good for about 15 minutes and then just shuts down--I can wait a few minutes and choke it and it will start again and run for a little while---Would this b… read more
Curtis B.
Curtis B.
Technician
Associate Degree
15,517 satisfied customers
I have a generator with a 27 hors brigg engine. it will crane
I have a generator with a 27 hors brigg engine. it will crane and run for aprox 2 to 3 mins. then shut down, just like you hit the kill button. then hit the electric start and it will crane and run fo… read more
Curtis B.
Curtis B.
Technician
Associate Degree
15,517 satisfied customers
My 20 hp B&S engine is emitting large amounts of grey smoke.
My 20 hp B&S engine is emitting large amounts of grey smoke. It started at about 28 hours of usage ( 1 week ago ). The spark plug is fouled with black soot and I replaced it. I always check the oil le… read more
mayhemmotor
mayhemmotor
mechanic
Vocational, Technical or Trade Scho
6 satisfied customers
B&S OHV 20 HP Twin cylinder on a John Deere riding mower runs
B&S OHV 20 HP Twin cylinder on a John Deere riding mower runs for 30 min ar so then stops.. Let it sit for an hour or two and it starts right up and then does the same things again. I changed the fuel… read more
Rick
Rick
Factory Authorized Trainer
Vocational, Technical or Trade Scho
4,218 satisfied customers
I have a older wizzard riding mower with a 16 hp v-twin b&s
I have a older wizzard riding mower with a 16 hp v-twin b&s motor that has always run perfect until yesterday, it started spiting and sputering and it looks like it is hardly getting any fuel to the f… read more
Jon K.
Jon K.
Small Engine Diagnostic Expert
Some College, military training,
2,995 satisfied customers
just replaced fuel pump on john deere 125 automatic B&S 20
just replaced fuel pump on john deere 125 automatic B&S 20 HP twin and still no fuel coming out of exit side (toward the carb). I started the mower 1st time on Saturday after sitting all winter. It ra… read more
jrloar
jrloar
Master HVAC Tech.
Associate Degree
15 satisfied customers
I have a SST18 Spinsteer mower with a Vangaurd v twin OHC that
I have a SST18 Spinsteer mower with a Vangaurd v twin OHC that just quits running like it ran out of gas. If I grab the choke in time it will keep running but not strong. My first thought was the fuel… read more
Dieseljunky2
Dieseljunky2
Locomotive Mechanic
Ford Certified Technician
310 satisfied customers
I have a Murray lawn tractor with a 20 HP B&S horizontal flat
I have a Murray lawn tractor with a 20 HP B&S horizontal flat twin (not a v-twin). Random no spark condition. Is this electronic ignition? It has a coil that looks like the old point and coil types bu… read more
Rick
Rick
Factory Authorized Trainer
Vocational, Technical or Trade Scho
4,218 satisfied customers
Husqvarna mower will not stay runing dies ever few min and
Husqvarna mower will not stay runing dies ever few min and dies again it cranks ok after it dies yth 1845 xp v-twin power kawasaki engine… read more
Delsley Jr
Delsley Jr
Handyman & JustAnswer Expert
IT Certificate
552 satisfied customers
B/S 16 HP V Twin engine model 30-3777, type 1147-e1 on a JDeere
B/S 16 HP V Twin engine model 30-3777, type 1147-e1 on a JDeere LT166 mower tractor. Starts easy, runs fine @ idle, seemingly forever. When mowing, will suddenly kill with wisp of white smoke. Will ki… read more
Chris Huber
Chris Huber
President
Vocational, Technical or Trade Scho
501 satisfied customers
Riding mower (1997 year) will not start. Has a B& S 18.5
Riding mower (1997 year) will not start. Has a B& S 18.5 hp Twin II engine (M/N= 42A707, Type=2238 E1, Code(NNN) NNN-NNNN). Previously engine would start cold fine, but not after running for awhile at… read more
J.R.
J.R.
Small Engine Technician
Vocational, Technical or Trade Scho
7,445 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