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James W
James W, Small Engine Troubleshooting Expert
Category: Small Engine
Satisfied Customers: 3708
Experience:  7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years
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I have a briggs and stratton 450 series 148cc, was mowing and

Resolved Question:

I have a briggs and stratton 450 series 148cc, was mowing and it just stop't. try'd new plug and still nothing
Submitted: 5 years ago.
Category: Small Engine
Expert:  James W replied 5 years ago.

James W :

Greetings, My name isXXXXX and I am here to help the best I can. My goal is 100% satisfaction. Let's get started.

James W :

In order to work your engine needs these things



  • Proper compression

  • Proper Gas / Air Mixture with good quality fuel.

  • Proper spark

  • Spark at correct time

  • Proper Lubrication (not required to start and run, but required for it to run very long).

James W :

We have to figure out what it used too have, and what it does not have now

James W :

did you hit ANYTHING? anything at all?

James W :

If the blade was loose, or if you hot something like a tree root, a water meter head, a piece of carpet, a ball of twine, a piece of fence or wire,

James W :

then yu may have a sheered flywheel key

James W :

you would still have spark, but it would spark at the wrong time

James W :

I would also check to make sure it has spark. the ignition can quit at any time

James W :

also the safety switch that shuts the engine off

James W :

may be bad

James W :

or there may be a short in the ground out wire that runs from the switch to the ignition coil

James W :

that is shorting the ign coil ouut

James W :

ALSO, if there was ANY dirt, water, or gas older than 30 days old in the gas tank

James W :

then the carburetor may very well be dirty

James W :

also, if this engine is the one that has a primer and the carburetor on top of the gas tank, the diaphragm between the tank and the car

James W :

very often dries out and needs to be replaced

James W :

the alcohol in the gas is to blame, but luckily this part is on;y $5 or so

James W :

gas can not sit for 30 days or it will turn to gum and varnish

James W :

ALSO I would check the compression with a meter

James W :

and see what it is

James W :

it must be at least 100 PSI (115 is better) for it to run right

James W :

let me know what you learn

James W and other Small Engine Specialists are ready to help you
Expert:  James W replied 5 years ago.
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