and will just about run and move slowly. When the fuel tank is nearly empty the mower runs properly for a few mins before it cuts out due to lack of fuel. Any ideas , thanks.
Briggs & Stratton

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It is likely that your Mountfield lawnmower will be powered by a 4-stroke engine. This means that the oil and petrol are stored within the machine in separate sections, eradicating the need for you to mix the two together.
The Mountfield 46B Petrol Rotary Hand Propelled lawnmower is a tough little worker with a steel deck and a 140 cc Briggs & Stratton engine designed to be easy to fire up.
The oil tank capacity is about 0,55 litre or 20 fluid oz.
Product details and specs. The Mountfield SP53H self-propelled lawn mower is powered by the Honda GCVx170 Autochoke 167cc OHV engine.
The lawnmower is a solid machine with a reliable honda engine on top.
On the cutting deck of your Mountfield mower there will be a silver label displaying the model, article number and serial number. The location of the label differs depending on the model you own, but it should be towards the back of the mower deck between the handles, or on the side.
Mountfield Ethos

When you buy a Mountfield mower you are buying a quality machine that will provide you with years of service and reliability. Mountfield are one of the UK`s best selling makes of walk behind mowers, this is because of the quality and service they have offered over the years.

Briggs & Stratton Corporation is an American manufacturer of gasoline engines with headquarters in Wauwatosa, Wisconsin. Wauwatosa, Wisconsin, U.S.
Mountfield started trading in 1962 with its rotary mowers. Since then, it has become the leading gardening equipment brand in the UK. Designed to provide customers with excellent value for money, Mountfield`s mowers and gardening maintenance top quality tools are known for their reliability.
Easy-to-use mower with a 46cm cutting width, 6 cutting heights and a mulching plug.
The oil tank capacity is about 0,40 litre or 14 fluid oz. c) If the oil level is low add Mountfield oil part number MX855 or a SAE 10W-30 oil, to the upper limit on the dipstick. Do not overfill; the oil level should not be above the UPPER LIMIT mark. Fill the fuel tank with unleaded petrol.
The easiest way to tell a 2-cycle engine from a 4-cycle engine is the number of fuel tank and/or oil sump fill ports. A 2-cycle engine has one fill port with a cap that has fuel pump and oil can icon. The cap will usually state the oil to fuel mix ratio.
Both the front and rear wheels are grooved with ball bearings. The Mountfield ST170 engine offers increased power compared to the other Mountfield engines in their Universal range. Always use fresh petrol in your engine as it can begin to go stale within 4 – 6 weeks.
2-stroke engines are generally used in handheld lawn equipment because the power per weight is greater than 4-stroke engines; this means that a smaller engine will pack more power than a smaller 4-stroke engine.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Lawn mower will start and run for 5 seconds and shut down
ANSWER : Will it stay running with your choke on? if so then clean your carb. if not then look for a blockage from tank to carb. ie fuel shut off, deteriorated fuel line. plugged filter etc

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I have trouble starting a toro walk behind mower
ANSWER : All, I thought my carb was shot, so I replaced it. Still, start but no run (and had to use starting fluid). THEN!!! I noticed the spring to the “rev limiter” (just below and towards rear of carb) was not “tight”. The stupid bracket that holds the end of that spring had been bent down ~1/16″ and that caused all this heartache. CHECK YOUR REV LIMITER!!!

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Mower start up and runs, but starts to cut back, and smokes just a little bit. The mower stops smoking when it throttle up. It will continue to run but not at full throttle. I can hold a finger gently over the fuel primer bulb and it will throttle up for a small time.
ANSWER : It sounds like she’s being deprived of the correct fuel / air mixture due to a dirty carburetor (the biggest problem with mowers when gas is left to sit for a period of time). If you do not know how to take the carburetor apart and clean it thoroughly, then I suggest taking it to the local shop (hardware store or mower shop) and having it tuned up. It’ll probably be just fine and worth the money. Hope this helps and good luck.James

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Nannie what can be wrong with my power devil petrol lawn mower the engine wont keep running then cuts out petrol and oil ok
ANSWER : Check air filter, check screen in bottom of fuel tank, New spark plug and also check the spark.If there is a weak spark, the coil may need to be replaced.If you have good spark, clean air filter, and clean fuel tank screen, then the carberator will need to be pulled of and cleaned out with solvent

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I have a husqvarna 323L string trimmer. I stored it after running the tank & carb dry for about two years. I fueled it, then started it, & it ran for a minute then died like I turned the switch off. Since it would not restart, I found the fuel filter had broken off the hardened fuel line & it sucked gummy crap out of the tank & into the carb. Failing at cleaning the carb, I finally put a new carb on it & replaced the pump, hoses & filter. It has ran good till this year. I winterized it with stabilizer & left it with a full tank over the winter. The gas in the tank was gone when I got ready to use it this year. I filled the tank with premix, checked for leaks, then started it. It would run fine for about half a tank, start idling poorly (lean) then cutoff & refuse to restart till I refilled the tank. I finally found the tank had cracks & was letting pressure out of the tank & apparently this was causing the carb to lose it’s ability to siphon gas out of the tank. So I replaced the tank which came with new hoses & a filter, which I properly installed to the carb. It cranked right up, but when it runs a half tank, the carb quits sucking gas out of the tank. When I pump to prime the carb, it moves the fuel into the carb, but the pump never gets hard like it does when I prime the carb when the motor is cold. I have to keep refilling the tank, prime, & then it starts & runs until the tank gets about half empty. The new fuel filter is down in the gas tank properly, but It will not run after it shuts off until I refill the tank & prime. I’m baffled. New tank, new hoses, new filter, new carb, & I can find no leaks in the fuel system. It runs strong. The 323L is a two-stroke & it always cranks on the second pull from cold on a full tank. Any ideas?
ANSWER :

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<!– from fixya rte –>Rj19lm plug gap for a 195cc 4cyl lawnboy – Lawn-Boy lawnboy" Mower Blade 21"
ANSWER : As a starting point in my shop i always use 0.30 in. For all my mowers

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Wont start no ignition put new plug in and fuel filter
ANSWER : Flush gas tank, fill with fresh gas and Stabil. Replace air filter. Remove bowl from carb clean bowl and holes in bowl screw.

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Lawn mower cranck but wont start…
ANSWER : Since you already checked for spark and air I would drain all the fuel out of it and check that fuel for water. Over time some lawn mowers end up with contaminated fuel. You can see the water sitting on the bottom of the fuel if you let it stand for a bit in a small plastic bowl.

Be sure to empty and dry out you fuel can as well. Especially if the mower stopped running right after a refuel. Which is a good sign your gas can is contaminated too.

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