Please note this thread has been inactive for 90 days. For the best results, please start a new thread.
Results 1 to 4 of 4
  1. #1

    Unhappy Right Prop for Yamaha 115 4 Stroke

    I have a 2005 Sea Swirl 19.5 Ft. Boat with a Yamaha 115 4 Stroke on it. The boat is very slow planning out with 4 people and only tops out at 38 mph @ 4900 rpm. It does not throw a rooster tail but spays out the sides. What prop should I use for better planning and speed ?

  2. #2
    Chief Petty Officer jevery's Avatar
    Join Date
    Jun 2006
    Location
    Oklahoma City
    Posts
    538

    Default Re: Right Prop for Yamaha 115 4 Stroke

    We need to know what prop's on it now to help. This 18-1/2 ft is hitting 6000 RPM and 37 MPH with a 17P prop. You definitely need to get your max RPM up at least close to 6K with a drop in pitch. I doubt you'll get more top speed, but you'll sure improve holeshot and planing speed. A 115 seems a tad small for a 19-1/2 footer.
    Bryant 214 Limited/FI 5.7
    Ranger 1850VS/Yamaha F150

  3. #3
    Senior Chief Petty Officer BaileysBoat's Avatar
    Join Date
    Sep 2008
    Location
    Ottawa, Ontario
    Posts
    684

    Default Re: Right Prop for Yamaha 115 4 Stroke

    Motor is a little small.

    Your tach can't be reading right.
    "Doris", 2007 Stanley Islander 19, Yamaha F150

  4. #4
    Supreme Mariner
    Join Date
    Apr 2002
    Posts
    16,783

    Default Re: Right Prop for Yamaha 115 4 Stroke

    Welcome,
    Considering the size of the boat your speed is pretty good.Is it by GPS?
    I to wonder about your tach/rpm and prop size.Size usually appears under the prop nut or on the barrel.

Similar Threads

  1. 150 Yamaha 4 stroke prop?
    By tcn426 in forum Prop Questions and Topics
    Replies: 1
    Last Post: May 2nd, 2009, 07:00 PM
  2. Yamaha 4 stroke Prop?
    By Rick1 in forum Prop Questions and Topics
    Replies: 5
    Last Post: January 19th, 2008, 11:00 AM
  3. yamaha f60 4 stroke prop help
    By frankgorshin in forum Prop Questions and Topics
    Replies: 5
    Last Post: January 2nd, 2007, 10:30 AM
  4. yamaha four stroke 115 prop
    By Cold Comfort in forum Yamaha & Suzuki Outboards
    Replies: 4
    Last Post: July 13th, 2006, 11:51 PM
  5. Yamaha 9.9, 4 stroke prop problem ??
    By jfc092 in forum Yamaha & Suzuki Outboards
    Replies: 1
    Last Post: October 14th, 2003, 02:40 PM
  1. iboats Forum Directory - Over 100,000 forum posts organized by topic