OMC parts 800 / Cobra outdrive drawings * How to videos

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OMC stern drive troubleshooting

Lower gearcase troubleshooting starts with the carburetor

  • OMC Stern Drive lower gearcase troubleshooting starts with the carburetor

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24940 Water fuel filter

24940 Water separating fuel filter

P/N 24940 $6.09

By author Trish Dougherty

  • 400 / 800 and stinger major mechanical lower unit technical outdrive troubleshooting points to inexperienced mechanical techniques isolating fuel and carburetor problems
  • Bottom line is idle speed in relationship to engine rpm is 20 to 50 percent over manufactures specifications
  • Carburetor adjustments are critical to clutch dog, forward gear and reverse gear relationship
  • Owners manual recommends 650 rpm. Most boats we get for repair are idling at 800 to 1000 rpm
  • Boating enthusiasts with limited mechanical skills should have carburator rebuilt buy local carburator repair shop listed in the yellow pages
  • NOTE Idle speed should not be adjusted to make up for poor balancing in carb flow between left and right side of carb
  • If your engine will not idle at 650 to 700 rpm #1 item to look at to isolate problems is carb balance
  • Water separating fuel filter should be changed once a year or one added to the stern drive motor
  • External return spring should be added to carburator to make up for play in linkage. This $2.00 spring could save you $2,000.00 later in repairs. See illustration
  • Check shifter box located on rear of engine for forward and neutral shifter return consistency in the water for broken or worn plastic pieces in the omc stern drive shifter control box

24950

24950 water separator kit

# 24950 $32.29

Water separating fuel filter help keep carburetor clean isolate water in tank and metal particles to filter area.

Carburetor Spring

Carburetor Spring

External return spring should be added to carburator to make up for play in linkage. This $2.00 spring could save you $2,000.00 later in repairs. See illustration