Ask Experts Questions for FREE Help !
Ask
    nuttyprofsr's Avatar
    nuttyprofsr Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Apr 1, 2009, 06:57 PM
    5hp Briggs and Stratton runs rich
    I've got a 5hp Briggs and Stratton Rototiller engine with a Pulsa-jet carb. This particular Pulsa-jet does not have the check valves in the pick-up tubes. Not required. All the parts are clean, the screens are clean, there is fuel in the constant supply cup. The needle valve isn't damaged and the jet is clear and looks fine. It has all been cleaned with carb cleaner. My problem is, it runs rich even with the needle adjustment valve turned all the way in. I can't figure out why it is doing this. The diaphram isn't torn but shouldn't have anything to do with it running rich. The diaphram just works the fuel pump. Any ideas what's causing this thing to run rich. It's as though the chock is on which it is not!:confused::rolleyes::(
    21boat's Avatar
    21boat Posts: 2,441, Reputation: 212
    Ultra Member
    		  
    #2

    Apr 1, 2009, 08:08 PM

    Its very possibly the needle valve is bad or the seat which the needle valve seats into witch is overlooked many times.

    Any tweak for the air adjustment to balance the "running rich"
    nuttyprofsr's Avatar
    nuttyprofsr Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Apr 2, 2009, 09:52 PM
    It ended up being the diaphram was stretched. I replaced it and it ran like a champ!
    21boat's Avatar
    21boat Posts: 2,441, Reputation: 212
    Ultra Member
    		  
    #4

    Apr 3, 2009, 02:58 PM

    Glad you found the problem
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Briggs & Stratton 16.5 OHV [ 19 Answers ]

I have a B&S 16.5 OHV MTD Yardman that will not turn over even though the starter and battery are OK. It will turn to a point and then stops. If I remove the spark plug it turns freely like it should. I know that removes the pressure in the cylinder but I don't know what could cause it to bind...

Briggs & Stratton 10 HP OHV Generator Engine runs rough [ 3 Answers ]

I have a portable generator with a Briggs & Stratton 10HP OHV engine. I store it for months at a time and then add just enough gas to run if for about an hour until it runs out of gas. After two years the engine now runs rough. I have to leave the run/choke switch almost on full choke to keep the...

Briggs & Stratton 16.5 [ 4 Answers ]

I have a MTD Mower OHV 16.5 B&S engine, Has New Battery , solenoid, starter, and valves have been set to .004 on intake .006 on exhaust. Will start and run till I shut it off and will not start again. It si only four years old. Any thoughts?

16.5hp briggs & stratton [ 3 Answers ]

Motor starts and runs for 10-15 seconds and then dies. Noticed lot of gas around air filter. Had carb rebuilt and still same problem.?

Briggs & Stratton 15hp runs rough at high speed. [ 2 Answers ]

I have a tractor mover with a Briggs & Stratton 15hp, it runs good at lowest speed only, unless I put it at full speed and full choke, it backfire out the muffler and shuts down at any other speed. I ran through the carb, seems clean unless I missed something, the float was stuck and it would...

View more questions Search