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2015 242 ls TOP SPEED

Discussion in 'Yamaha AR240, SX240, 242 Limited / S / X/ E-Series' started by Hezi, May 22, 2018.

  1. Hezi

    Hezi Member

    Messages:
    40
    Location:
    Secaucus NJ
    Ratings:
    +14 / 2
    Boat Make:
    Yamaha
    Year:
    2015
    Boat Model:
    Limited S
    Boat Length:
    24
    So I can't get more than 42 MPH from my boat with 4 men on board. I thought I should inspect my impellers after I beached on my last outing and I am sure I pushed bottom material (mainly sand) through the jets. Going out with a friend with 2013 242 LS last weekend, he is topping 50 MPH but his motors are at 8000 RPM. My motors don't go over 7400 RPM.

    I'm either low on RPM and need to adjust the throttle cables or damaged one or 2 impellers. Maybe a combination of the two. Can anyone suggest what is your top RPM? How to check impellers? or a path to solve this?

    I have 40 hours on the motors BTW.
    Thanks
     
  2. greg

    greg Jet Boat Lover

    Messages:
    110
    Location:
    Sanford Florida 32771
    Ratings:
    +59 / 0
    Boat Make:
    Yamaha
    Year:
    2015
    Boat Model:
    AR
    Boat Length:
    24
    You should get close to 50. I can get 52 with my 2015 ar240. Should also get 7800 rpms. Maybe replace spark plugs.
     
  3. McMark

    McMark Jetboaters Lieutenant

    Messages:
    1,110
    Location:
    Monongahela, PA
    Ratings:
    +1,066 / 24
    Boat Make:
    Yamaha
    Year:
    2015
    Boat Model:
    AR
    Boat Length:
    24
    2015 AR240. Solid 50mph boat.
     
  4. Dave Baran

    Dave Baran New Member

    Messages:
    12
    Ratings:
    +3 / 0
    Boat Make:
    Yamaha
    Year:
    Other
    Boat Model:
    242 Limited S E-Series
    Boat Length:
    24
    Since it is pretty early in the season still, you may have water in your fuel from old gas that sat over the winter. If you trailer your boat and you use normal "car" fuel it has 10% alcohol in it. Alcohol absorbs moisture. It will dilute the fuel so to speak. I'd recommend running your tank out and getting all the sludge out of it; if its bad then you may have to have the tank pumped out. Then fuel up at a station that sells 100% gas; which has no alcohol in it. Some "car" gas stations do sell it, you have to call around. This may get you the extra power you are looking for. Cheers.
     
    • Like Like x 1
  5. Hezi

    Hezi Member

    Messages:
    40
    Location:
    Secaucus NJ
    Ratings:
    +14 / 2
    Boat Make:
    Yamaha
    Year:
    2015
    Boat Model:
    Limited S
    Boat Length:
    24
    Thank you for the advice. I did fill the tank 3 times already after almost finishing the fuel. In the last two tanks, I added Sta-Bill fuel additive. Same results. Next on the list is to tear the jets down and inspect the impellers and increase tension on the throttle cable to get more than the current 7400 RPM I am getting
     
  6. Chief

    Chief New Member

    Messages:
    7
    Location:
    Lake of the Ozarks, Missouri
    Ratings:
    +4 / 0
    Boat Make:
    Yamaha
    Year:
    2016
    Boat Model:
    242 Limited E-Series
    Boat Length:
    24
    2016 242 limited E-series...top speed 50mph @ 7475 RPM....1 crew, 50% fuel load....i use regular gas from the car gas station(E10)......fuel burn is 25.2 gph or 1.98 mpg at top speed.
     
  7. Ronnie

    Ronnie Jetboaters Admiral

    Messages:
    4,501
    Location:
    SF Bay Area
    Ratings:
    +3,355 / 54
    Boat Make:
    Yamaha
    Year:
    2010
    Boat Model:
    Limited S
    Boat Length:
    24
    Are you sure you and your buddy have the same engines? The CARB “California air resource board” boats have catalytic converters and produce less hp/kw. If you can’t tell by looking at the engines check the ID/Info plates for the kw rating of each.
     
    • Agree Agree x 1
  8. Chief

    Chief New Member

    Messages:
    7
    Location:
    Lake of the Ozarks, Missouri
    Ratings:
    +4 / 0
    Boat Make:
    Yamaha
    Year:
    2016
    Boat Model:
    242 Limited E-Series
    Boat Length:
    24
    You can tell by looking at the engines between the 3 star and the 4 star CARB enignes....the 3 star engines have loop on the dip stick for your finger....the 4 star engines have just a knub on the dip stick.
     
    • Informative Informative x 1
  9. Freezer41

    Freezer41 Jet Boat Addict

    Messages:
    159
    Location:
    Junction City, OR
    Ratings:
    +135 / 0
    Boat Make:
    Yamaha
    Year:
    2015
    Boat Model:
    Limited S
    Boat Length:
    24
    CA CARB boat my max is 51 when it was just me on board. I had 4 adults and 2 kids last week and 43 was the max. Then with 2 adults and 2 kids a couple days later got 46. My elevation is 320ft. Top RPM 7400-7500 I think
     
  10. Jim McGovern

    Jim McGovern Member

    Messages:
    1
    Ratings:
    +0 / 0
    Boat Make:
    Yamaha
    Year:
    2015
    Boat Model:
    AR
    Boat Length:
    24
    I have a 2015 AR 240 and 52 mph is top speed.
     

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