Question about Briggs & Stratton Lawn-Boy Insight Series 21-Inch 190cc 650 Series Gas Powered Engine Variable Speed Self-Propelled Lawn Mower
Gardline lawn mower DYM1666. Product 8846 nearly new. Burns spark plug out after using only twice. Has had 3 spark plugs in 5 months.
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Posted on Jan 02, 2017
your engine is only running on the fuel you are pumping in, the carb. is not lifting the fuel on its own, maybe because of water in the bowl or dirty jets. You must take the bowl of and clean it out and depending on the type of carb. it might need a new diaphragm. Stephen.
Posted on Apr 25, 2010
Testimonial: "very helpful. will follow instructions. Thank you"
Hi and welcome to FixYa, I am Kelly.
There are 7 different versions of this engine. I need to know which one you have by model number. Model number examples are listed below:
Without that information it is difficult to help you. What I will say is usually a dirty air cleaner makes an engine runs rich. (Too much gas)
However.. speaking in generic terms on must Briggs and Stratton engines there is a single fuel air mixture jet screw on the side of the carburetor body. To reduce the amount of fuel being used you turn the screw clockwise. (screw in) You should not have to turn the screw more than 1/8 turn to get the correct fuel mixture. If you have to turn it more than 1/8 turn first suspect the air filter and last would be a problem with the float level or float needle. I can provide manuals for float needle and float level repairs if you respond with an engine model number.
Thanks for choosing FixYa,
Posted on May 19, 2011
Sounds like you have dirt/debris in your carburetor jets,fuel passages or a diaphgram that is becoming non-flexible.
Be sure to check your fuel tank for water and dirt/debris, if there is water/debris then you need to clean your tank.
Also check you fuel line condition after a while they will degrade and need replacment.
Check/Clean/Replace your fuel filter if you have one.
When you remove your fuel lines from the carburetor be sure to make a drawing to how the lines are connected to the carburetor.
Also make sure you are using fresh fuel...and oil mix if your using a two cycle mower or weedeater with the oil to the right mixture and not too much oil as it can cause hard starting.
If the mower/weedeater is over a couple of years old, then I 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.
Sounds like you will need to clean the carburetor or replace your carburetor internal rubber parts like the diaphgram and O rings.
I recommend that you use a laquer thinner type cleaner to clean and dissolve the laquer build-up in the float and needle jet passages.
Be sure to remove all plastic and rubber parts before using the laquer thinner because it can dissolve the plastic parts and render them unuseable.
Be sure to use compressed air to blow out all the fuel and air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Sometimes you can get by with priming the carburetor or using starting fluid 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.
Keep in mind that the float (if you have one) for the carburetor must be level when you go to reassemble the carburetor or follow the instructions you get with the carburetor kit.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their orginal position before you started.
Once you have your carburetor rebuilt that should solve your problem.
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Posted on Jun 19, 2011
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