Question about Poulan 38-Inch Steel Deck 15.5 HP Briggs & Stratton I/C Engine With 5 Speed

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My lawnmower cranks up but do not start. Oil and gas are full, air filter is clean>

Hi, my mower will not start up. It cranks up but it will not start. I checked the gas, the oil, and the air filter. they all are good. what do you mean ground it

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I had the same problem with mine and I had to adjust the valves, it is easy to do you take the spark plug out then remove the valve cover and rotate the engine until the lower valve is completely depressed, then you loosen the adjusting nut on the top valve using a star wrench and a #10 box end wrench, use the star wrench to loosen the lock nut inside the adjusting nut then tightening the nut until a .004 feeler guage sildes snugly between the spring and valve, lock the nut down and rotate the enging until the top valve is depressed and adjust the lower valve the same way, reinstall the valve cover and plug and it should start right up.

Posted on Jun 02, 2009

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Posted on Jan 02, 2017

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I have a Toro lawnmower oil is coming out on the filter side of the lawnmower...what could be the problem


1) has the mower been turned on its side recently?
2) Oil level? too full? gasoline smell ?
3) Replace the air filter
4) When cleaning mower, always keep the air filter up. Turn it on its left side.

Mar 29, 2017 | Toro Garden

1 Answer

Why won't it fire up?


lawn mower trouble shooting, no start
First check the air filter. Is it getting air and gas? If not lets find out why.
1. Air Filters; There are 2 types. One is made of paper and the other is made of foam. NOTE: (Whenever you lift your lawnmower for any reason disconnect your spark plug and ground it.) NOTE: Do not run your engine or any engine without the air filter, it will RUIN the motor. When lifting your lawnmower on its side, always lift it with the carburetor up. A little oil Will come out, but not enough to hurt anything. If you lift your lawnmower with the carburetor down oil & gas will go everywhere. If your air filter is made of paper the oil & gas will ruin it. If not you will have to clean your foam one.
a. Paper filters cannot be cleaned with gas or any solvent, you can only use compressed air to blow the dirt out. If it's very dirty, it's best to replace.
b. Foam filters can be cleaned with dish washing liquid and water and dried with a rag. Then very liberally, work new engine oil throughout the air filter and squeeze out excess. The oil in the filter is what traps the dirt. If your foam filter is deteriorating or coming apart replace it, it can ruin your engine. Clean every 25 hours under normal conditions. Note: Use the same type of engine oil you use in your small engine to lightly oil your filter.2. Check your gas cap. The gas cap is a source of ventilation for the fuel tank. If your gas cap is clogged it will make your fuel tank vapor lock, and you will have no gas flow. To check and see if the gas cap is bad, loosen the gas cap and see if it will run longer than before you loosened the gas cap. If it continues running, you need to replace the cap, if it does not continue running check further in this troubleshooting guide for more information.
3. Is the fuel line clogged or partially clogged? Example: when you disconnect the fuel line from the carburetor and the gas is steadily flowing there is not a problem. But if it only drips with a full tank of gas replace it after checking the gas cap.
4. Do you have a fuel cut off? If so, is it cut on?
5. Do you have a gas filter? If so is it clear? If not, replace it.
6. Is the gas flowing in to the carburetor? If not you could have a piece of trash in the needle & seat. The needle & seat controls the gas flow that starts & stops the gas. You will have to clean or replace. It's best to replace.
7. The float controls the gas level in the carburetor. If any of these signs occur, the carburetor is overflowing out of your air filter or out of your primer. If you have gas in your oil, you have carburetor problems. NOTE: Drain the oil if there is gas in it, if you don't it can be dangerous. You need to check the needle & seat to see if it has trash or is bad. Is your float bad? To check the float pull the pin that holds your float in place, shake the float and if there is fluid inside of the float, replace it. Don't forget to set the float level.
8. Carburetors with primers represent a large majority of lawnmower and small engines today. They have primers to push or force air in the carburetor and in turn force gas through the center jet to make starting easier. Then look to see if the primer is pumping gas in to the engine.

9. Things to check for if the primer is not working. This applies to several different types of engines. Check for holes or tears if you have a carburetor that has a diaphragm. (A diaphragm is a gas pump located in carburetors that have the gas tank and carburetors assembled together.) Replace the diaphragm if the diaphragm has a hole or has hardened or slightly slid over to one side, or if the engine will not run correctly and is skipping, not priming, or will not run at all. If you have a float type carburetor, the bowl gasket Will not be sealed properly and air will leak past the bowl gasket and will not prime. If you have a air assembly primer box where the air filter box is connected to carburetor, your gasket Will not be sealing correctly. If there is a tear or a hole in the gasket, air will leak past it and will not force air in the carburetor which will not force gas through the center jet. Also your air assembly box Will have a crack and will be warped because it was over tightened. If so, replace it.
10. Some models have chokes. Chokes are used to draw gas through the center jet to run. If the choke is not working properly and it is not closing all the way the engine cannot draw gas through the center jet and will not crank.

11. The throttle cable is what operates the choke on some models and the primer on some others, but it works the speed of the engine. To adjust the throttle that works the choke you need to loosen the throttle and open the throttle all the way, then push it until the choke is closed all the way. To adjust a "speed only" open the throttle all the way and make sure that the engine speed will be all the way open and then tighten the cable back up on the engine. Make sure if you have a kill switch on the throttle cable, that it works when you lower the speed all the way. If not, adjust again. Carburetors: Carburetors are the cause of 99% of all small engine problems. Carburetors are the easiest thing to repair on small engines.

We have videos to that will help you in the repair of your Lawn Mower and Small Engine

Section 2 Troubleshooting safety switch system
1. Spark. There are several things that would keep a lawnmower or small engine from sparking like the safety switches. Lawnmowers and small engines have several different locations where the safety switches Will be. If your lawnmower or small engine doesn't spark you need to get your owner's manual and find out where your safety switches are and then try to trace the problem.
2. Oil sensor. If you have one ... The oil sensor will make your lawnmower or small engine quit running until you fill it with oil to the "full level." This will cause the engine not to spark because of the oil being low. NOTE: This is a safety feature to protect your engine from running out of oil.
3. Stop cable or blade brake. This cable is connected to the handle bar and you have to hold the handle bar down for your engine to run. This cable becomes stretched after some time and needs to be replaced. There is a safety switch on the other end of that cable, on the motor, that Will not be opening all the way and in turn, not letting the engine spark.
4. Coils. Lawnmowers and small engines have changed a lot in the last 15 years. 99% of all lawnmowers and small engines today have electronic ignition coils which means no points. When you start your lawnmower or small engine and it runs until it gets hot and won't start back again until it cools off you Will have a bad coil.

Lawn Mower Repair Troubleshooting Lawn Mower

Jan 16, 2016 | Garden

1 Answer

My lawnmower is fuming when i start it. what is causing it?


Is the air filter clean? Dirty air filter creates a vacuum sucking too much gas.
Is the choke not working properly?
It it's black smoke it's burning too much gas.
If it's blue smoke it's oil. If it's oil smoke did you over fill when you put oil in.
Over filling the oil will cause it to smoke.
Bad piston rings will cause the oil to burn also.

Oct 09, 2014 | Garden

1 Answer

Lawnmower starting problems


Clean or replace air filter. Fill oil, 30w. Clean & gap plug or replace.
Remove carb bowl from bottom of carb & clean. If gas is 30 days or more old, use fresh gas with Stabile.

Jun 19, 2013 | Garden

1 Answer

My snapper hi-vac niwer us hard to start. I can't pull hard enough to get it to start. It uses straight gas, not mixed with oil.


If you are having problems starting your mower you shouldcheck 3 things, air, fuel and spark.

Fuel: check to make sure you are full of good quality fuel, try to start theengine several times then take out the spark plug and it should look wet. If its not wet then you aren't getting fuel into the engine.

Air: remove and clean the air filter with clean gasoline if its made offoam. If its made of paper then you should buy a new one from a localauto parts or hardware store.

Spark: disconnect the spark plug wire from the spark plug and hold thewire close to the engine block. Try to start the engine and watch for aspark to jump between the end of the wire and the engine block. If itdoesn't then either the wire is bad or the ignition coil is bad.

Jun 09, 2011 | Snapper 217020b Lawn Mower Mowers...

1 Answer

I hev a briggs & Stratton 5.25hp lawnmower and


I would need the engine numbers to tell ya what to do for sure. It sounds like the engine is too full on oil. Check oil levels carefully.That engine capacity is only 1 pint/16 to 20 oz's ALSO you friend may have cleaned under your deck and turned the mower with the aircleaner DOWN. That causes oil to flow from the crankcase into the air cleaner and muffler.That aircleaner is a dry paper and should not have any oil on it, If this is the case then the oil accumulated in the muffler will burn off in time. Oil soaked paper aircleaners will cause this engine not to start.IT CANT BREATH

Oct 21, 2009 | Briggs & Stratton Lawn-Boy Insight Series...

2 Answers

Lawnmower wont start


Possible Causes Corrective actions
Unit will not start Control handle is not engaged Engage control handle spacer.gif spacer.gif
Spark plug wire is disconnected Connect spark plug wire spacer.gif spacer.gif
Fuel tank empty or stale fuel Replace with clean, fresh gas spacer.gif spacer.gif
Blocked fuel line Clean fuel line spacer.gif spacer.gif
Faulty spark plug Replace, clean, or adjust gap spacer.gif spacer.gif
Engine flooded Wait to restart, do not prime spacer.gif spacer.gif
Air filter filled with dirt or debris Replace or clean air filter

May 23, 2009 | Mtd 22" Yard Machine Push Mower

1 Answer

Mountfield sp470


Hi, first you'll have to change the air filter and the spark plug. now, go buy some hi octane gas. drain the old gas and put the fresh gas in. if this don't solve your problem please write again.

Nov 20, 2008 | Garden

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