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2015 Yamaha 242 - Engine life - How many hours?

Discussion in 'Yamaha AR240, SX240, 242 Limited / S / X/ E-Series' started by Krabi Sunset, Apr 10, 2018.

  1. Krabi Sunset

    Krabi Sunset New Member

    Messages:
    25
    Location:
    Krabi, Thailand
    Ratings:
    +13 / 0
    Boat Make:
    Yamaha
    Year:
    2018
    Boat Model:
    242 Limited S E-Series
    Boat Length:
    24
    Assuming a boat is run in correctly, cared for and serviced appropriately and didn't spend it's whole life with the throttle wide open, all day... how many hours before one is looking at rebuilding the engines in a 2015 Yamaha 242 Limited S?
     
  2. boudin

    boudin Member

    Messages:
    58
    Location:
    Houston, TX
    Ratings:
    +48 / 0
    Boat Make:
    Yamaha
    Year:
    2008
    Boat Model:
    AR
    Boat Length:
    21
    My guess would be well over 1000, maybe 2000+. The non-HO MR1s in VX110 rental skis see those kinds of numbers. I would not consider a rebuild until you start seeing significant oil burn, and/or greatly reduced RPM.

    Do regular maintenance, and check the service manual to see when things like timing chain, tensioner, valve adjustments, etc. should be done.

    -Greg
     
    • Agree Agree x 2
  3. 112Vulcan

    112Vulcan Member

    Messages:
    54
    Location:
    Cape Coral, FL.
    Ratings:
    +21 / 0
    Boat Make:
    SeaRay
    Year:
    2005
    Boat Model:
    Other
    Boat Length:
    29
    Does anyone know what the motor replacment, timing chain, valve adjustment runs ($$$) ?
     
  4. swatski

    swatski Jetboaters Admiral

    Messages:
    6,022
    Location:
    Saint Louis, MO
    Ratings:
    +6,133 / 98
    Boat Make:
    Yamaha
    Year:
    2016
    Boat Model:
    AR
    Boat Length:
    24
    Yamaha boat engines are second to none. Keep in mind, unlike cars and trucks, marine engines are designed for "continuous duty" and can be run WOT all the time. Those Yamaha 1.8 and MR-1 engines are raw water cooled and maintain perfect operating temps at WOT as the cooling system works at its best.

    I have known several commercial fishing operators in NE, they tend to run their o/b fleets approx 2,000+ hours, all WOT, and that's the "norm". Then re-power. If you worry about longevity - it's the maintenance and how the engines are used that's most important. I would take a well maintained high-hours all WOT yammie over one that's low hours but sitting around and possibly neglected, especially if used in salt water.

    --
     
    • Agree Agree x 3
    • Informative Informative x 1
  5. Scottintexas

    Scottintexas Jetboaters Captain

    Messages:
    2,522
    Location:
    Corinth, TX (DFW)
    Ratings:
    +1,480 / 32
    Boat Make:
    Yamaha
    Year:
    2007
    Boat Model:
    AR
    Boat Length:
    23
    welcome aboard Krabi!

    as the others stated, it's a long ways out if even just the most basic of oil changes/flushing is done,

    I also take solace in knowing the engines are in jet skis which are asked to do much more extreme rpm's swings and run harder than the boats
     
  6. Cobra Jet Steering LLC

    Cobra Jet Steering LLC Jetboaters Captain

    Messages:
    2,586
    Location:
    Florida
    Ratings:
    +2,412 / 48
    Boat Make:
    Yamaha
    Year:
    2014
    Boat Model:
    Other
    Boat Length:
    Other
    I love the 1800 engines I have had supercharged and regular engines I do oil and filter every 50 hours plugs once a year average well over 150 hours a year, only had one timing chain fail on one at around 350 hours and Yamaha repaired it. There are some minor issues that usually require some attention as well as things to avoid or watch out for like anything mechanical but for the most part very reliable engines and pumps.
     
  7. AZ Native

    AZ Native Jet Boat Lover

    Messages:
    119
    Location:
    Phoenix, Arizona 85044
    Ratings:
    +118 / 7
    Boat Make:
    Yamaha
    Year:
    2013
    Boat Model:
    Limited S
    Boat Length:
    24
    I've meant to ask why we are changing the plugs so often? Is it because the engines don't get hot enough and carbon builds up on the plugs? I assumed that raw water cooling is a problem for these engines when running slow or at normal cruise. I pulled the plugs this weekend on the 2013 I just bought. The boat has 97 hours on the engines, but the plugs have some build up and the appearance looks like the were beginning to rust (I assume they were never replaced, but all look exactly the same). I have new ones going in, but I'm not sure what to be looking for.
     
  8. Cobra Jet Steering LLC

    Cobra Jet Steering LLC Jetboaters Captain

    Messages:
    2,586
    Location:
    Florida
    Ratings:
    +2,412 / 48
    Boat Make:
    Yamaha
    Year:
    2014
    Boat Model:
    Other
    Boat Length:
    Other
    Well I use my stuff constantly last year I spent 151 days on the water that is how I get so many hours . A set of plugs a year may not be necessary but it's just habit. I have several things I do before any new engine ever sees the water. I know I have done many posts listing those . If I can't get any more 1800 engines I probably will keep the ones I have longer than the usual 650 hours. I always put a 5 year warranty on my new skies and I log in that amount of hours in 4 years. That is because I have 2 and I alternate them each time I go out I use a different one . And I drive them very slowly and cautiously.
     
    Last edited: Apr 12, 2018
  9. swatski

    swatski Jetboaters Admiral

    Messages:
    6,022
    Location:
    Saint Louis, MO
    Ratings:
    +6,133 / 98
    Boat Make:
    Yamaha
    Year:
    2016
    Boat Model:
    AR
    Boat Length:
    24
    I must say the spark plug replacement is a bit of a habit, not necessarily needed every year - in 1.8s. Mine look something like that, all the exact same:
    upload_2018-4-10_23-54-38.png

    Do those need to be changed? - probably not.

    In MR-1s I think it is a different story - plug changes seem to cure a vast array of problems there, for reasons that are not completely clear...

    --
     
  10. boudin

    boudin Member

    Messages:
    58
    Location:
    Houston, TX
    Ratings:
    +48 / 0
    Boat Make:
    Yamaha
    Year:
    2008
    Boat Model:
    AR
    Boat Length:
    21
    Much of the problem I've seen comes from folks consistently overfilling the oil reservoir, and subsequently fouling plugs. When overfilled, oil will blow back in to the intake through the breather hose. Make sure the check the oil when the engine is well warmed up, and oil is pumped up back into the reservoir.

    -Greg
     
    • Informative Informative x 1
  11. ClemsonTiger

    ClemsonTiger Jetboaters Lieutenant

    Messages:
    368
    Location:
    Jupiter, FL
    Ratings:
    +864 / 96
    Boat Make:
    Other
    Year:
    NA
    Boat Model:
    Other
    Boat Length:
    Other
    Mine lasted 150hrs before I ditched it...1.8L
     
  12. AZ Native

    AZ Native Jet Boat Lover

    Messages:
    119
    Location:
    Phoenix, Arizona 85044
    Ratings:
    +118 / 7
    Boat Make:
    Yamaha
    Year:
    2013
    Boat Model:
    Limited S
    Boat Length:
    24
    @swatski Thanks for the photo. Mine don't look that good, reinforcing my contention that the plugs haven't been replaced since the boat was built. The new ones arrived this week from Summit Racing. I'll get to see if they improve performance. Having just moved from the MR-1's in my 2005 to the 1.8's in my 2013, I can vouch for the issues with plugs fouling and overfilled oil getting sucked into the intake and air filters. The 1.8's don't have either of these related issues.
     
    Last edited: Apr 13, 2018
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