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21 hp OHV briggs endurance blowing smoke and spark plug oil fouled

Using a lot of oil, compression seems fine, spark plug has carbon deposits and oil fouled; smokes when blades under load; lot of carbon build up around where exhaust pipe enters muffler.

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: 22hp Briggs problem. Loading up, runs

Try checking the prefilter on your air filter. I had a similer problem and mine prefilter was completly covered in dirt. I changed the air filter and it solved my problem. Also make sure the air intakes are not partially clogged with dirt or other stuff.

Posted on Jul 20, 2009

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mowerman1857
  • 389 Answers

SOURCE: Briggs and Stratton 22hp v twin OHV smoking badly

First thing to do is pull your dipstick and check for broken or missing O-ring also as you pull it, look to make certain that it was seated properly and all the way locked. If either condition exists, you will be leaking into the crankcase which will cause your symptoms

Posted on Sep 14, 2009

  • 4088 Answers

SOURCE: 27 horse power briggs on poulan pro. It smokes,

Very likely, the piston rings are badly worn or stuck. There may even be a small hole in a piston. In any case, you will need a major tear-down to repair this one. This is usually caused by lax oil-changes. It might be better to purchase a replacement engine than try to fix everything that could be wrong with the present unit if you take into account parts and labor. Hope this helps!

Posted on May 24, 2010

  • 54 Answers

SOURCE: I have a 21 hp

It sounds like the oil was filled way too much and was kicked around violently as you started it, usually the oil filler plug will show full with only an inch or less showwing on the dip stick which is part of the plug. You have to screw it in and take it out to get the right measurement. Also cold weather may be making your oil very thick if it is a multi weight 20-50W oil for trucks, it is super thick when starting up. I would try a light oil like 10-30 if allowed in your manual, keeping in mind this motor always travells 3500 rpm where a truck or car would only be doing 700 rpm when cold started. For very cold startup conditions I would use Syntec 5-30W 100% synthetic oil (it's about five times more expensive than most) which I use in a 2002 VW diesel Jetta turbo with great results so far and it still gets 65 mpg after 10 years driving!

Posted on Apr 11, 2011

xclubcar98x
  • 111 Answers

SOURCE: Briggs & Stratton Vertical OHV Engine 18 hp

Check your oil.

If it is overfilled, milky, or smells like gas. Your going to need to change that ASAP. It sounds like the float has stuck in the past or is still sticking, and it has flooded the crankcase with gas, which has mixed with the oil. And because it is overfilled it comes through the breather hose into the carb. This also explains the smoke most probably because the oil is spewing in the carb through the breather and being burned.

Posted on Jul 05, 2011

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Engine seems to run fine as long as the plug is not fouled however it smokes and leaks oil from the fuel pump. It seems as though there is too much crank case pressure


oil from the fuel pump may indicate a failure of the diaphragm of the fuel pump and petrol is getting into the sump
that will raise the oil level to a point where the oil ring can longer control the oil getting to the top of the piston
it is possible that the sump breather hose is blocked or if it has a small pvc valve that that is blocked

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Oil is spraying out the oil fill tube and going into fuel pump through pulse hose, what is causing this


check the compression in both cyclinders. this is usually an internal problem. and is most likely a head gasket. you can obtain a compression gauge at your local auto parts store. usually for a deposit then return.take both spark plugs out at same time. install gauge in spark plug hole and spin starter over . then try the other cyclinder.

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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.

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1 Answer

Low power when under load lt1024 cub cadet 24 hp els 725 ohv


always check spark and compression first spark needs to be blue and compression should be 120 but will barely run on 80psi if both are fine rebuild and acid dip carb also check muffler for carbon build up clogged muffler means no power

May 16, 2012 | Briggs & Stratton Briggs Stratton Intek V...

1 Answer

Briggs & Stratton Vertical OHV Engine 18 hp blowing white smoke engine run great but a lot of smoke and also have oil being spit out of the black hose that come from engine to the carb.


Check your oil.

If it is overfilled, milky, or smells like gas. Your going to need to change that ASAP. It sounds like the float has stuck in the past or is still sticking, and it has flooded the crankcase with gas, which has mixed with the oil. And because it is overfilled it comes through the breather hose into the carb. This also explains the smoke most probably because the oil is spewing in the carb through the breather and being burned.

Jul 05, 2011 | Briggs & Stratton Briggs Stratton Intek V...

1 Answer

I have a problem wiht my 25 Hp vanguard backfireing


There are lots of possibilities.
If the sparkplugs are fouled that can cause a weak spark, carbon residue that can ignite the incoming gas too soon.
A plugged muffler is also a common cause, and will happen the most at highest RPM.
Cross firing wires can also do it.
If nothing else, it could be a burned or misadjusted valve, which a compression test would help determine.

Mar 12, 2011 | Briggs & Stratton Briggs Stratton Intek V...

1 Answer

I have an old 3.5 hp Briggs and stratton on a masport lawn mower, it has started blowing smoke when it is unning, could someone give me a clue as to whether this is likely to be rings, vaulves, etc, or is...


Hello,

Start by checking the oil level. It should not be overfull. If it is it will smoke, and it will soak your air filter , then foul your plug.

Check this first.

Let me know,Matt

Dec 10, 2010 | Briggs & Stratton Briggs Stratton Intek V...

1 Answer

2004 v twin 16 hp 500hours on it runs but spits fuel throught carb when giving gas runs like its missing on one cylinder replaced carb, plugs, fuel filter, it has 120 lbs of compression in each cylinder...


You should take one of the heads off and look at the valves. You may have deposits building up no the valves.

120 pounds compression sounds pretty good for a six year old engine with 500 hours on it. It probably started life at 9 to 1 and now is around 8 to 1.

May 05, 2010 | Briggs & Stratton Briggs Stratton Intek V...

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