Tohatsu 70 blow bubble at idle

Discussion in 'Powerboats' started by GeorgeHHV133, Apr 15, 2018.

  1. GeorgeHHV133
    Joined: Apr 2018
    Posts: 1
    Likes: 0, Points: 1
    Location: Melbourne

    GeorgeHHV133 New Member

    Hi there, newbie here. Have a small problem with my tohatsu outboard 70 HP motor. When it is in idle it blows a lot of big bubble below the water level. Is some filter blocked? Hope some of you has experience can give some advice. Motor is near new serviced regularly
  2. gonzo
    Joined: Aug 2002
    Posts: 16,247
    Likes: 1,376, Points: 123, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    That should be the exhaust
    fallguy likes this.
  3. fallguy
    Joined: Dec 2016
    Posts: 6,567
    Likes: 1,329, Points: 123, Legacy Rep: 10
    Location: usa

    fallguy Senior Member

    Your vital check is the water pump telltale (stream). I check mine on all starts; after awhile, it becomes habit. If the water pump impellers have failed or you get a blockage in the system; the water stream drips or stops. If so, stop and debug up to replacement of impellers to avoid overheat and engine damage.

    If you weren’t aware the bubbles are exhaust; figured it’d be good to inform; at the risk of patronizing.
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