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Why does my Briggs & Stratton mower engine struggle to start and does not reach full power and spark plug goes black after fitting new one

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Sounds like your choke is stuck on or if there is a set screw on the carb you need to turn it in a little so you are not feeding it too much gas.

Posted on May 07, 2017


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Posted on Jan 02, 2017


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As far as I know there is no primer or choke on the 675 lawn mower engine. How do you start motor without pulling plug and shooting gas in spark plug hole?

Some mowers have a type of auto choke on them. Some Briggs and Stratton choke themselves when the engine speed is slow, and un-choke when the engine reaches full rpm.

If you need further help, I’m available over the phone at

Jun 29, 2016 | Garden

2 Answers

I have A briggs & stratton 300 engine. When I start the motor surges at idle and full throttle.

Leaking head gasket or intake gasket

Try a new spark plug & fresh fuel first,
& clean the air filter

Sep 26, 2014 | ROPER OUTDOOR POWER PRODUCTS Weedeater 20"...

1 Answer

Briggs stratton model 100000 sart problem ?

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

Fuel: check to make sure you are full of good quality fuel, try to start the engine 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 of foam. If its made of paper then you should buy a new one from a local auto parts or hardware store.

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

Reply to this solution when you find the problem and I can tell you how to solve it.

Jun 08, 2011 | Briggs & Stratton Lawn-Boy Insight Series...

4 Answers

Hard to start lawn tractor

I have 2009 lawn tractor that will not start (from day 1) unless I use a small squirt
of start fluid into the air cleaner area. Nothing else seems to work. The battery will run down before it starts. Once engine is warm it starts great. Love the tractor,
hate the starting problem. Elevation is not a problem in michigan.

Jan 11, 2010 | Briggs & Stratton Briggs Stratton Intek V...

1 Answer

190cc 3in1 briggs and stratton mower wont start... new plug and good spark..any ideas..

Take the carburator apart and clean it. Also, clean needle and seat. Please let me know if this helps.

Apr 24, 2009 | Briggs & Stratton Lawn-Boy Insight Series...

1 Answer

2 1/2 Briggs......doesn't run smoothly....surges at all speeds.

Hi, Check that you have the correct spark plug fitted or fit a new one as it sounds like your plug is getting hot then shorting out.
Sometimes the magnito can do this as well. but I would start with the plug.

Nov 26, 2008 | Garden

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