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I have just topped up my mountfield sp470 lawnmower with oil and petrol and know it's just stopping with smoke coming out the engine what could be the problem

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Too much oil or oil in gas

Posted on Apr 26, 2015

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Posted on Jan 02, 2017

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mowerman1857
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SOURCE: How do I replace primer bulb on mountfield SP470

I believe this mower has a Briggs & Stratton engine, if that is the case:

Look at the base of the primer bulb where it is mounted on the carburetor, you will see an opening on both sides of the plastic that the bulb is mounted in where the locking tabs are.

Take two small screwdrivers, press in on the tabs and pry toward the outside of the housing at the same time to release the tabs and bulb. Pull the entire bulb and mounting ring out as an assembly. Don't worry too much about damaging the ring, a new one should come with the new bulb, in fact, it would be wise to purchase the new bulb prior to beginning so you can see what you are working on

Posted on Nov 03, 2009

Testimonial: "Many thanks for your expert advice, as soon as the weather picks up I will replace said primer bulb. "

  • 37 Answers

SOURCE: 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.

Posted on Nov 23, 2008

SOURCE: How do I change a worn Carburettor Gasket and

Hunting and erratic operation are signs of air leaks or diminished fuel flow at WOT settings.

If this mower is running a vacu jet style carb with a diaphragm you simply take off the air cleaner, the vent tube, and then the four screws holding the carb on the gas tank and after the carb body can be lifted remove the throttle linkage so you can flip over the carb and pull the main jet and clean the inlet screens.
http://www.psep.biz/store/briggs_stratton_carburetor_kits.htm

Posted on Aug 11, 2010

kel1guy2002
  • 3740 Answers

SOURCE: i have a mountfield sp470

Hi. The SP470 has a 4 HP Briggs and Stratton engine.

The part number should be 687171 and you can look here:

http://www.worldofmowers.ltd.uk/Products/ProductList.aspx?search=Head+gasket+&type=3&searchBtton.x=20&searchBtton.y=10

Take a good look at the valve end of the head gasket. From the pictures on the page you should be able to see which one of the 4 head gaskets on the page is yours.

If you have yellow pages you can look up lawn mower repair. Or small engine repair shops. All of them should have this commonly used headgasket in stock. Just find one close to you or.. use the link above.

Here is yet another link for the head gaskets but you have to scroll way way down the page or page search for 698717 or 272171.
http://www.briggsbits.co.uk/acatalog/Horizontal_crankshaft_2-7_HP_Sidevalve_Engines.html

Thanks for choosing FixYa.

Kelly

Posted on Sep 12, 2010

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Hi. The SP470 has a 4 HP Briggs and Stratton engine.

The part number should be 687171 and you can look here:

http://www.worldofmowers.ltd.uk/Products/ProductList.aspx?search=Head+gasket+&type=3&searchBtton.x=20&searchBtton.y=10

Take a good look at the valve end of the head gasket. From the pictures on the page you should be able to see which one of the 4 head gaskets on the page is yours.

If you have yellow pages you can look up lawn mower repair. Or small engine repair shops. All of them should have this commonly used headgasket in stock. Just find one close to you or.. use the link above.

Here is yet another link for the head gaskets but you have to scroll way way down the page or page search for 698717 or 272171.
http://www.briggsbits.co.uk/acatalog/Horizontal_crankshaft_2-7_HP_Sidevalve_Engines.html

Thanks for choosing FixYa.

Kelly

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How do I change a worn Carburettor Gasket and Diaphram on a SP470 B&S Engine on my Mountfield Lawnmower? I'm good at DIY. The engine is hunting and running erratically.


Hunting and erratic operation are signs of air leaks or diminished fuel flow at WOT settings.

If this mower is running a vacu jet style carb with a diaphragm you simply take off the air cleaner, the vent tube, and then the four screws holding the carb on the gas tank and after the carb body can be lifted remove the throttle linkage so you can flip over the carb and pull the main jet and clean the inlet screens.
http://www.psep.biz/store/briggs_stratton_carburetor_kits.htm

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How do I replace primer bulb on mountfield SP470 lawnmower


I believe this mower has a Briggs & Stratton engine, if that is the case:

Look at the base of the primer bulb where it is mounted on the carburetor, you will see an opening on both sides of the plastic that the bulb is mounted in where the locking tabs are.

Take two small screwdrivers, press in on the tabs and pry toward the outside of the housing at the same time to release the tabs and bulb. Pull the entire bulb and mounting ring out as an assembly. Don't worry too much about damaging the ring, a new one should come with the new bulb, in fact, it would be wise to purchase the new bulb prior to beginning so you can see what you are working on

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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.

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