Single Cylinder Briggs and Stratton OHV VALVE ADJUSTMENT Procedure and Specs



HARD STARTING? Won’t START? Riding Lawnmower. Briggs and Stratton single Cylinder OHV. VALVE Adjustment Procedure. Tutorial. Jeff’s Little Engine Service demonstrates HOW TO Troubleshoot and Diagnose a 16 HP Briggs and Stratton OHV Engine (procedure covers ALL HORSEPOWER single cylinder INTEK Motor). Model, motor models 31C707, 28700, 28P700, 28Q700, 28S700, 28U700, 28W700, 28770, 310700, 311700, 312700, 313700. How to ADJUST the VALVES on a 16 Horsepower Briggs and Stratton OHV overhead valve Engine single cylinder. VALVE ADJUSTMENT PROCEDURE Specifications specs. Is it the valves? VALVE PROBLEM on a Riding Lawnmower motor. . Difficulty turning over. Too much compression. Trouble turning over? Same for many models Adjusting the valve lash valves Intek Craftsman Toro Troy-Bilt Poulan Snapper Sears Hayter Mountfield Lawnflite Snapper Yard Machines mtd ayp yardman yard man lawnboy Battery solenoid electrical problems. PLEASE KEEP IN MIND when you are watching my videos: I am showing you the least expensive, quickest “backyard” methods for repairing or servicing your lawnmower. Replacing all components such as gaskets and fuel lines is always recommended when rebuilding or repairing equipment. With these videos I hope you are able to fix and repair your lawnmower yourself with minimal parts, knowledge and tools. Thank you for watching!
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23 thoughts on “Single Cylinder Briggs and Stratton OHV VALVE ADJUSTMENT Procedure and Specs

  1. Thanks for all the effort you put into making these videos, they are extremely helpful!
    I replaced a broken flywheel key on my 14.5 B&S OHV yard machine riding mower.
    I also adjusted the valves. Everything seems okay but when trying to start nothing happens and I cannot turn the flywheel manually. If I loosen the flywheel bolt I can spin the flywheel and also engage it by attempting to start the mower. Yet if I tighten the flywheel bolt even slightly, the flywheel will not spin. Any thoughts on what I am missing? Thanks!

  2. I wrote out notes for myself to do this away from internet. Sharing here:
    TOOLS:
    10mm open end wrench
    Feeler gauges
    Spark plug wrench/socket
    3/8 socket
    Long screwdriver (8-12” shaft)
    T20 torx bit

    PREP:
    Remove engine cover 
    Remove valve cover
    Remove hood and light cable
    Remove spark plug (and check gap .030)
    Remove valve cover, w rag underneath to catch any oil drips. 
    Rap cover all around to pop it loose. Or pry, but save gasket if you can. reusable. 
    Exhaust valve rocker is on top (steel pushrod)

    FIND TOP DEAD CENTER:
    Rotate engine by hand clockwise until both valves close as piston pushes screwdriver out as far as possible. 
    Just after intake valve closes = power stroke.
    Continue to rotate further until screwdriver reenters cylinder by 1/4''. 
    Adjust valve gap at that point
    Hold outer nut with 10mm and turn inner torx counterclockwise. 
    (Tighten studs if loose at engine casting. Aluminum heads, so not too tight)

    SET GAP:
    Set 5-7 thou. exhaust valve. Set using .006 feeler
    Set 3-5 thou. for intake. Use .004 feeler
    Turn outer 10mm nut w fingers until feeler gauge is held snugly. 
    Then hold outer nut w 10mm to not change setting while tightening torx set screw.
    Tighten torx set screw to 5 ft lbs. 60 in/lb. (Can use wrist rotate only, not elbow grease, to not over torque)

    Ok to reuse intact gasket. May need thin coat of gasket seal if it has been leaking onto exhaust.
    Replace all other covers and reattach lights.

  3. You mentioned to position the cylinder after intake and before exhaust 1/4" past TDC. Nobody else had those details. One guy even had the exhaust and intake backwards. Good job on your part.

  4. I know a couple of people that will set both on 2 to 2 and a half. They did it for years. I have never read anywhere where they set them that close. Could it be because they didn’t rotate the piston down 1/4”?

  5. I'll be putting my engine back together in a little bit and will do this for sure…. I'm honestly amazed the difference that just made. I've had a motor in the past where I'd have to hit the key and take my hand and spin the top of the motor over… Obviously this was the problem! Thank you so much

  6. You're turning the engine in the WRONG direction. The B&S manual stipulates that the engine is to be turned counter-clockwise for valve adjustment.

  7. Im having yo put in a new head gasket and yours explains the valve clearance process better than any of the other videos i have warched. Thanks!

  8. Check leakdown to check rings, valves, and head gaskets. Adjust the valves. If a rocker arm is loose, the valve seat could be loose. Replace the head. With the rocker off, remove the spring and move the stems back and forth to check the guides. If worn, replace the head. With rockers off, if the valve sticks, hit the spring with a hammer to unstick the valve. Replace the springs since they lose tension. Check head bolt torque. Remove the spark plug to make turning the engine easier. Get an insert kit in case the plughole strips.

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