Fixes for motor surge

Discussion in 'Bubba's Outboards' started by Bubbakat, Dec 9, 2009.

  1. Bubbakat

    Bubbakat New Member

    Messages:
    4,532
    State:
    McMinnvill
    PROBLEM 1: OUTBOARD ENGINE IDLES ROUGH AND STALLS
    PROBLEM 2: OUTBOARD ENGINE RUNS UNEVEN OR SURGES
    PROBLEM 3: OUTBOARD ENGINE WILL NOT ACCELERATE
    POSSIBLE CAUSE CORRECTIVE ACTION
    fuel tank air vent closed or restricted check - air vent must be open all the way and free from restrictions
    a pinched, cut or restricted fuel line; also loose fuel line connection check all fuel lines and replace as needed; check and tighten all fuel line connections
    a dirty or restricted fuel filter check, replace or clean all fuel filters
    restricted filter in fuel tank clean by rinsing in clean lead-free gasoline or kerosene
    improperly mixed fuel; cpmta,omamts (water. dirt, etc.) in fuel check fuel and replace if necessary
    An inlet needle (in carburetor) that is either stuck open or closed. (A needle that is stuck open will cause a flooding condition. A needle that is stuck closed will prevent fuel from entering carburetor.) remove and replace with new inlet needle
    incorrect idle mixture adjustment re-adjust
    damaged fuel pump diaphragm replace
    carburetor is loose tighten bolts securely
    chamber cover leaking air tighten or replace gasket
    off idle holes plugged blow out with compressed air
    main nozzle or idle nozzle air bleed holes plugged blow out with compressed air
    improper main jet or restricted jet clean or replace with proper jet (refer to Main Jet Chart at bottom of this page)
    damaged reed(s) inspect reeds as outlined in Service Manual
    a crack in the fuel pick-up outlet tube (located in fuel tank) replace
    a crack in the fuel outlet tube (located in fuel tank) replace
    Anti-Sipon valve restricting fuel flow refer to restricted fuel flow & troubleshooting fuel pumps in Mercury and Mariner outboards

    PROBLEM: FUEL BLOW-BACK OUT OF CARBURETOR
    POSSIBLE CAUSE CORRECTIVE ACTION
    chipped/broken (reed-block) reeds replace reeds
    PROBLEM: ROUGH IDLE
    POSSIBLE CAUSE CORRECTIVE ACTION
    if related to reed-block, indicates excessive preload in reeds replace reeds
    PROBLEM: CAN'T REDUCE ENGINE RMP TO SLOW IDLE
    POSSIBLE CAUSE CORRECTIVE ACTION
    multiple chipped reeds replace reeds
     
  2. tbull

    tbull New Member

    Messages:
    3,318
    State:
    SW Ohio
    Great post Bubbakat thank you very much!:wink: