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Old 16 July 2015, 15:44   #1
Country: UK - England
Town: Warwickshire
Boat name: Sea Warrior
Make: Flatacraft -fletcher
Length: 4m +
Engine: 3.0 Merc. 40HPMarine
Join Date: Jul 2015
Posts: 27
F100 4CYL 4 Stroke High idle

The motor is idling high, (about 1.5K RPM) is it as simple as adjusting an idle screw? Any advice would be welcomed.

Mattacraft is offline   Reply With Quote
Old 18 July 2015, 11:49   #2
Country: UK - England
Town: bicester
Length: no boat
Engine: outboard only
Join Date: Feb 2009
Posts: 913
If it was fast idling on either muffs or a tub of water ,I wouldnt worry about it at the moment, if it is still fast sitting on the water, check the throttle arm/s are touching the stop, and that the throttle cable not adjusted to tight and hasnt slipped, if all those are correct then i would advice to to contact your nearest dealer.

uncle al is offline   Reply With Quote
Old 19 July 2015, 14:59   #3
Country: UK - England
Make: Ribcraft
Length: 5m +
Engine: Yamaha
Join Date: Feb 2006
Posts: 285
It should be idling at approx 700-800 in water, out of water on muffs will increase 100rpm.

If left at 1500 you are doing damage to the engagement dog when shifting into gear.

Is it actually revving too fast or is the tacho incorrectly set?

If it is revving too fast and cables are all adjusted correctly then the idle screw is normally wound in to mask stalling due to slight restrictions in the low speed jets.
phantom 19 is offline   Reply With Quote

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