Small Engine

Small Engine Troubleshooting Problems? Ask a Mechanic Now.

Ask an Expert,
Get an Answer ASAP!

Have a c30 mayco concrete pump which has a 30hp Wisconsin…

Customer Question
Have a c30 mayco...

Have a c30 mayco concrete pump which has a 30hp Wisconsin engine. getting spark from the spark plugs. It's like there's no gas getting to the piston heads. The fuel pump has no wires running to it so it must be engine driven. Tried pouring gas down the carburetor and using starter fluid much does not work. Pulled the manifold off just get puffs of smoke coming out of the piston heads. It's like there's no gas getting to the heads. What started the hole thing was there was some dried concrete in the pump line when the boys tried to start it up it started but the drive built from the pump to the motor started smoking so they shut it down and I have not been able to get it started again. Have all new parts, distributor cap, rotor, coil, spark plugs, spark plug wires. Stumped.

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

That's all I know it won't fire up

Submitted: 2 years ago.Category: Small Engine
Show More
Show Less
Ask Your Own Small Engine Question
Answered in 9 minutes by:
2/21/2016
Technician: Curtis B., Technician replied 2 years ago
Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 31,449
Experience: have worked on and around most engine models for 35 yrs./Polaris ATV expert
Verified

Engine model number? If you have spark and fuel in the cylinder and it did not fire, it may be out of time. What does it have for a timing key in flywheel or ???

Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago

My response is showing as customer!

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
Don't know that there is fuel getting to the piston heads. trying to figure out how the fuel get from the fuel pump to the cylinder heads. the only line running out of the fuel pump is to the carburetor and nothing out of the carburetor.
Technician: Curtis B., Technician replied 2 years ago

The cylinders suck the fuel from the carburetor. What is model number of engine? Only reason fuel would not be sucked in, if there is no intake vacuum. If you hold hand over carburetor do you feel it sucking?

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
no I do not
Technician: Curtis B., Technician replied 2 years ago

Is this twin engine? If you remove spark plugs, do you have compression?

Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago

If it has compression, remove rocker covers and check the valves.

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
4 cylinder
Customer reply replied 2 years ago
I have compression
Technician: Curtis B., Technician replied 2 years ago

Check the valves

Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago
Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago

You can have compression, and the intake valves are not opening, so the fuel is not sucked into the cylinders.

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
since I took the manifold off I get puffs of smoke out of each one of the cylinder head opening.
Technician: Curtis B., Technician replied 2 years ago

You say you don't feel suction at carburetor, so intake valves may not be opening

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
where are the intake values. do I have to pull the heads to get to them.
Technician: Curtis B., Technician replied 2 years ago

You still haven't given me a model number. Did you see the link I sent on the Wisconsin models? There will be a valve cover somewhere, that will let you look at the valves.

Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago

The crankcase vent should lead to it.

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
The engine is so old and has been repainted so many times I cant find a model number on it. The only thing I know is it's a 30hp Wisconsin some where around a 1992
Technician: Curtis B., Technician replied 2 years ago
Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago

This VH4G, see page 27 , showing valve covers. But sheet metal has to be removed.

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
looking down inside the carburetor through the butter fly valve look like a copper stem that comes out. I see no gas being let out of it when trying to start it.
Technician: Curtis B., Technician replied 2 years ago

If y don't have intake suction,there will be no fuel from carburetor!

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
It's doesn't smell flooded for as many times as I have tried to start it. Could the carburetor need to be cleaned?
Technician: Curtis B., Technician replied 2 years ago

You said it did not fire on starting fluid, there is something else wrong!

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
If your saying the gas is sucked out of the carburetor in to the piston heads and I have the manifold removed so there's just a hole opening above the piston heads then the starter fluid sprayed into the carburetor would do no good.
Technician: Curtis B., Technician replied 2 years ago

Will it fire if you spray starting fluid into cylinders?

Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago

If you look into the intake holes. do you see valve movement?

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
No it won't fire if I spray starting fluid into each one of the holes. just puffs of smoke.
Technician: Curtis B., Technician replied 2 years ago

Look in the intake to see if you see the valve or stems, and see if they are moving.

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
couldn't see that far down inside but put my finger down inside and felt them moving.
Technician: Curtis B., Technician replied 2 years ago

It takes fuel, spark, and air , at the proper time for engine to run. Seems like spark , compression, and air are good! And will not fire on starting fluid, so its timing or valves in my miand. Did you look at the VH4g manual link I sent? Does it look like right engine?

Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago

I need t be out for an hour. Will check back later.

Ask Your Own Small Engine Question
Customer reply replied 2 years ago
Not exactly close. I probably need to take it to a small engine repair shop. Thanks for your valuable help but I think it's a little above me
Technician: Curtis B., Technician replied 2 years ago
Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago

Here is newer model. Please rate to close the question.

Ask Your Own Small Engine Question
Technician: Curtis B., Technician replied 2 years ago

Please accept to close, or I don't get credit.

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: 31,449
31,449 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

31,449 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

2,902 satisfied customers

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

Wayne

Wayne

Engine Rebuilder

2,006 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
Kohler 20 h. Vtwin in pug cheetah. Have changed plugs and
Kohler 20 h. Vtwin in pug cheetah. Have changed plugs and wires with attached coil. Has fresh gas. Motor misses bad runs the same bad with alternate wires pulled and then started on the oother one. Ca… read more
Curtis B.
Curtis B.
Technician
Associate Degree
31,449 satisfied customers
I have a handheld leaf blower, new carb new plug coil and
i have a handheld leaf blower, new carb new plug coil and mag are both good. will only start by removing plug and placing fuel directly onto piston then it will only run until fuel burns off . pouring… read more
Donald
Donald
Owner / Technician
High School
2,507 satisfied customers
JD x320 after about 30 minutes mowing it dyes, then pops,
JD x320 after about 30 minutes mowing it dyes, then pops, motor turns over but takes a while to restart, tried gas cap trick no difference, once it does start it puffs a little dark smoke then runs fi… read more
Curtis B.
Curtis B.
Technician
Associate Degree
31,449 satisfied customers
I have a John Deer with a 19.5 hp motor. It is running really
I have a John Deer with a 19.5 hp motor. It is running really rough and has black/grey smoke. I check the spark plug and and found oil on it. The compression is 105 psi. Is this the rings or valves? o… read more
Curtis B.
Curtis B.
Technician
Associate Degree
31,449 satisfied customers
This is an Onan,(###) ###-####01. The customer is a mechanic,
This is an Onan,(###) ###-####01. The customer is a mechanic, but can figure this thing out. He went through the carb, it will run, kinda, on full choke only. Turn on the PTO and it will run for about… read more
Curtis B.
Curtis B.
Technician
Associate Degree
31,449 satisfied customers
I had a troy built mower in storage for 3 years made a mistake
I had a troy built mower in storage for 3 years made a mistake and turned it on. Made a lot of smoke and turned off in 5 seconds. the gas will not stay in the tank anymore and will not crank. All it d… read more
Curtis B.
Curtis B.
Technician
Associate Degree
31,449 satisfied customers
I have Kawasaki KAF540c mule. I tried to start it and the engine
I have Kawasaki KAF540c mule. I tried to start it and the engine won't fire. I put a new spark plug in it which didn't help. I then checked the fuel line leading from the bottom of the gas tank to the… read more
Curtis B.
Curtis B.
Technician
Associate Degree
31,449 satisfied customers
My Troy Built Tiller with a kohler Mag 8 engine starts and
My Troy Built Tiller with a kohler Mag 8 engine starts and runs only if you pour excessive gas into the spark plug hole. It will continue to run until you cut it off but will only restart using the sa… read more
J.R.
J.R.
Vocational, Technical or Trade Scho
7,173 satisfied customers
I have spark and although I do not have a gauge the
I have spark and although I do not have a gauge the compression seems to be ok. I am putting a small amount of fuel right into the chamber and it still won't start.… read more
Trianglesmallengines
Trianglesmallengines
Project Manager/ Technician
Journeyman Technician
62 satisfied customers
Hi, Thank you for your time. My JD lawn tractor starts and
Hi, Thank you for your time. My JD lawn tractor starts and than idols rough. The throttle can not be moved up to higher RPMS for about 10 minutes or until it starts idling smoothly. I than move the th… read more
J.R.
J.R.
Vocational, Technical or Trade Scho
7,173 satisfied customers
Engine suddenly stopped. Pulled the start rope and nothing
Engine suddenly stopped. Pulled the start rope and nothing happened. Turned the edger blade and had no resistance.… read more
Jon K.
Jon K.
Small Engine Diagnostic Expert
Some College, military training,
2,995 satisfied customers
Hello I accidentally poured oil down the hole under the airfilter
Hello I accidentally poured oil down the hole under the airfilter on my B&S lawn mower. Yikes what can I do to save it? It won't start and the pull cord seems stuck ( I already cleaned the air filter … read more
ranwell1
ranwell1
CEO
High School or GED
5,039 satisfied customers
I have a Lawn Boy model 7072 from 1985. Im having trouble
I have a Lawn Boy model 7072 from 1985. I'm having trouble getting it started. If I prime it with 4 pumps and hold my breath, it may cough but after that there is no response. I went away on vacation … read more
TaxTom
TaxTom
Accountant
Bachelor's Degree
14 satisfied customers
I have a kohler cv16s that ran fine on Wednesday. Go to start
I have a kohler cv16s that ran fine on Wednesday. Go to start this morning and it cranks but wont run. plug is fine and getting spark, gas is getting to plug and actually now leaking out muffler nos t… read more
Curtis B.
Curtis B.
Technician
Associate Degree
31,449 satisfied customers
Hello. I have a John Deere LA115 Riding Lawn Mower. Before
Hello. I have a John Deere LA115 Riding Lawn Mower. Before winter it was working great. I just broke it out, and now it won't start (Prior to winter I did prep it with fuel stabilizer). The engine tur… read more
Hank F.
Hank F.
Service Technician
High School or GED
5,365 satisfied customers
My mower wont start. It ran for a couple minutes, sputtered,
My mower won't start. It ran for a couple minutes, sputtered, a little black smoke and then cut off. It has new gas in it. The oil is clean and has about 31 hrs. on it. When I try to start it, it smel… read more
Rick
Rick
Factory Authorized Trainer
Vocational, Technical or Trade Scho
4,218 satisfied customers
I have a Briggs and Stratton 13hp motor on a DR Field and Brush
I have a Briggs and Stratton 13hp motor on a DR Field and Brush mover. This morning the unit ran for a while, then sputtered and died. I have drained the fuel tank and put in fresh fuel...I have repla… read more
J.R.
J.R.
Vocational, Technical or Trade Scho
7,173 satisfied customers
My Lawnman push mower wont start. It has gas, oil and a ...
My Lawnman push mower wont start. It has gas, oil and a brand new spark plug. It doesnt seem to have a choke. I dont know much about lawn mowers. I could swear I saw A (little) puff of black smoke com… read more
Motorcycle Tech
Motorcycle Tech
1,297 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