Question about Briggs & Stratton Briggs Stratton Lawnmower Lawn Mower Short Block

Open Question

Briggs & Stratten 600, Plugs foul (black coating) seems to be running rich. Mower runs but lower power and pulses like it is about to kill.

Posted by on


6 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 211 Answers

SOURCE: my lawn mower will not turn off


From under the flyweel comes a wire(probably black).check it.It is connected with the off position of the trotle.

best regards savumihai71

Posted on Dec 22, 2008

  • 389 Answers

SOURCE: how much oil to put in a 6.25 briggs and stratten

They hold APPROXIMATELY 20 ounces. Put in around 18 oz and start checking the dipstick and adding a little until it gets to the full or MAX or whatever it says on your particular engines stick. Each time you ad a little, give it a chance to drain down or you will get a false reading

Posted on Sep 20, 2009

  • 4 Answers

SOURCE: Briggs & Stratton Quattro lawn mower

computerscot is right. This engine is not designed to run slower than a few hundred RPM below maximum. The carb has a built-in fuel pump that only operates properly at relatively high speed. Your motor probably has either missing or weak throttle springs which will lower the RPM. Replace them and adjust the tension so that the speed is up. For a diagram of the carb and springs, check the Briggs & Stratton online user manual maintenence section. Look for file "briggsandstrattonMS5373-GB.pdf".

Posted on Oct 30, 2009

  • 7482 Answers

SOURCE: I can crank my murray gas lawn mower 6.5 quantum

Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming it a few times, and letting it
run a few times like that and it will flush the gunk out of the jets,
but most of the time you will need to rebuild the carburetor.
If the mower is over a couple years old, then I also recommend that you
buy and install a new carburetor repair kit, because the diaphragm will
get hard and that will cause it to be hard to crank.
When you clean your carburetor and remove the jet screws, count the
number of turns it takes to seat the jets from their original position.
That way when you go to put the jets back in, you know how many turns
they were in/out.
Please rate me, Thanks
Good Luck, I hope this helped

Posted on May 15, 2010

  • 1 Answer

SOURCE: briggs & stratton 550 / surges, gas hog

check your air filter. If it's clogged, the engine will spool up to keep from dying, run for about 15 seconds, then it will happen again. If that's it, just clean the air filter. Solved my problem

Posted on May 17, 2011

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I have a polaris 600 which i cannot seem to keep spark plugs. On a good day maybe every 100km and the plug blows. i have tried different brands but no different. It is a new machine and have had it b

If your plugs are fouling the plug is not the problem. your carburetor setting are to rich. secondly if you run a hotter plug it will help stop the problem. another thing I found out was that the helps is to let off the choke as soon as possible. running with choke on to long only fouls plugs

Jan 30, 2015 | Winter Sports

1 Answer

Spark plugs foul immediately

Fouled plugs may be caused by oil leaking into the cylinder. Does it smoke when running (cold), are you using up the crank oil. Black smoke is excess gas comsumption, blue smoke is oil burning. If your plug is fouled with black carbon, you are most likely running to rich.

Apr 07, 2014 | Briggs & Stratton Briggs Stratton Vanguard...

1 Answer

Keeps fouling plugs

3 things are the main causes of black soot. 1 not enough air, check air filter. 2 running too rich, lean out the carb. there will be 2 screws on the carb 1 to increase idle speed and 1 for air mixture. While running turn the mixture screw in until it sputters then back it out 1 turn. 3 bad timing. If the mower hits a rock or branch the shear pin can get creased and change the timing(it is to protect the crankshaft from breaking) Here is a link to a youtube video showing how to change the shear pin.

Aug 09, 2013 | Briggs & Stratton Garden

1 Answer

Mower won't start spark plug turns black

Black carbon fouling on the plug is a sign of the engine running too rich, start by replacing the air filter and plug and try again.

Jun 16, 2012 | Toro Power Lawn Mower

1 Answer

Our Husqvarna YTH2148 mower has been in the shop twice and we can't figure out what's causing black, sooty fouling of the spark plugs.

Hi, change the engine oil. It has become contaminated with fuel. Also fit an inline fuel tap and turn it off whenever the mower is not in use. Basically the carby has leaked fuel into the engine oil, the engine then draws the fuel vapour from the oil through the crankcase vent into the carby creating the problem you have. Regards Phil.

Jun 03, 2012 | Husqvarna Garden

1 Answer

I bought a 92 fzr 600 ride it for a month no problem. But now it keeps popping the resistor in the spark plugs. 3 sets of plugs in the last 2 weeks. Last set lasted 2 days. All have been ngk.

NGK plugs dont stop, especially all at once, so there is another problem.
There are some resisters in the plug caps that can fail.
Are the plugs carbon fouling?(dry black) if so make sure the air filter is new, and oil is changed.
Does the enginge blow smoke or use oil?(wet black)oil fouled may mean rings.
Fuel fouled may mean the jettting is wrong or choke stuck open
Its the battery good(new) and charging ,put a multi meter across the terminals 12v stopped, 14v running approx.
it always helps to drain the carb bowls every few weeks
If exhaust is not standard, the jetting may be wrong.
does the fuel tap work correctly? only use the run or res positions never pri
A short in the kill switch or a worn ignition switch can cause a miss or backfire

May 28, 2011 | 1992 Yamaha FZR 600

1 Answer

95 VT600 DLX spark plugs foul after about 200 - 300 miles in rear cylinder

If they are black when you pull them out with oil on you them probably need new rings or its possible that the engine is running rich and fouling the plugs and needs carbs adjusted.

Jul 03, 2010 | 1995 Honda VT 600 C Shadow

1 Answer

I have no rpm's mower only runs slow. plugs foul with black carbon after 30 minutes. This is a murray 6.5 hp brigs any solutions


May 20, 2010 | Briggs & Stratton Garden

1 Answer

My B & S fouls plugs, runs rough, almost stalls when blade


Jul 11, 2009 | Briggs & Stratton Briggs Stratton Intek V...

Not finding what you are looking for?
Briggs & Stratton Briggs  Stratton Lawnmower Lawn Mower Short Block Logo

Related Topics:

81 people viewed this question

Ask a Question

Usually answered in minutes!

Top Briggs & Stratton Garden Experts

Phil Walker
Phil Walker

Level 3 Expert

608 Answers

John Trevino

Level 3 Expert

1388 Answers

donald boissonneault

Level 2 Expert

110 Answers

Are you a Briggs & Stratton Garden Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides