yamaha fuel consumption
Page 1 of 3 123 LastLast
Results 1 to 15 of 45

Thread: yamaha fuel consumption

  1. #1
    Senior Member
    Join Date
    Jan 2004
    Location
    Cape May
    Posts
    690

    Question

    First and foremost I would like to thank all the guys who chimed in on my key west thread.
    My next question is approximately how much fuel does a 2000 yamaha 150 two stroke burn. There is a specific reason I am asking this. I found a 2000 Key West 2020 w/a that has the 2stroke 150.
    The new one has the 4. The 2000 is half the price and in excellent condition. So, my decision now is will the fuel cost of the 2 stroke be so much higher that it would make more sense for me to just buy the new one. The dealer with the new one says guys are getting 3gal per hour at cruising speed with the new 4 stroke and the dealer with the used boat says the 2 stroke burns about 22gal. per hour at cruising speed. that seems kinda high. I was always under the impression that on average according to the formula alot of people use a 150 would burn approximately 15 gph at wide open throttle. I also realize there are alot of variables to consider like weight and prop pitch and all. I am really trying to make this purchase and educated one so sorry for being so long winded.
    "Instant Karma"
    2006 KEY WEST 2020 W/A BLUEWATER

  2. Remove Advertisements
    TheBassBarn.com
    Advertisements
     

  3. #2
    Banned
    Join Date
    Jan 2005
    Location
    cape may nj
    Posts
    2,690

    Post

    2 stroke outboards,carb'd will burn approx 10% of their hp rating in fuel per hour.example,150 hp 15 gph at full throttle.now the same engine will burn 1/2 of that 15 gph figure at cruise speed.example,15 gph@full throttle,then 7.5 gph at cruise speed..
    that 4 stroke engine has a lot more moving parts then a 2 stroke,therefore,greater potential for failure.the 4 strokes will require more maintainance then the 2 stroke....but i don't want to start a 2stroke vs 4 stroke battle....

  4. #3
    Senior Member
    Join Date
    Oct 2004
    Location
    Huntingdon Valley/WW Crest
    Posts
    4,819

    Post

    jrigzguy...check your mail...I sent a 2 stroke yamaha fuel consumption chart in pdf format
    Its 4:20 someplace.....
    Sharks have a week dedicated to him..AAAI-ISMA Certified Cycling Instructor
    AAAI-ISMA Certified Kick Box Instructor

  5. #4
    Senior Member
    Join Date
    Sep 2000
    Location
    Now West Deptford from Elk Twp, NJ USA
    Posts
    2,970

    Post

    3 gallons is right on for my 4 stroke.
    Not a yamaha

    [ 11-22-2005, 09:06 AM: Message edited by: design ]

  6. #5
    Senior Member
    Join Date
    Oct 2005
    Location
    Lumberton, NJ .. Home Port: Mystic Island
    Posts
    226

    Post

    Here is performance data for a 20' century with a 150 yammaha 4 stroke.
    http://www.iboats.com/sites/centuryb...cc-f150txr.pdf

    And here is one for a 22' Grady with the 150 yammaha 2 stroke.
    http://www.yamaha-motor.com/assets/p...1123-GRW-Z.pdf

    If you compare numbers, youll see that the 2 stroke burns about double the gas all around.

  7. #6
    Senior Member
    Join Date
    Oct 2005
    Location
    Lumberton, NJ .. Home Port: Mystic Island
    Posts
    226

    Post

    If you dont have adobe acrobat here is the chart.
    Yammaha 150 4-stroke
    RPM MPH GPH MPG
    1000 4.5 0.8 6.00
    2000 7.2 1.9 3.79
    3000 19.3 4.0 4.81
    4000 31.8 6.6 4.82
    5000 39.4 10.3 3.84
    5500 43.2 14.0 3.10


    and the 150 2 stroke

    RPM MPH GPH MPG
    1000 5.5 3.2 1.72
    2000 8.3 6.4 1.30
    3000 14.5 10.9 1.33
    4000 33.35 14.1 2.37
    5000 41 21.3 1.93
    5600 47.4 30.2 1.57


    sorry about the format, I tried making it all nice to read, but it doesnt work.

    [ 11-22-2005, 01:37 PM: Message edited by: Luna-tik ]

  8. #7
    Senior Member
    Join Date
    Jan 2004
    Location
    Cape May
    Posts
    690

    Post

    perfect! thanks guys.
    "Instant Karma"
    2006 KEY WEST 2020 W/A BLUEWATER

  9. #8
    Senior Member
    Join Date
    Oct 2001
    Location
    Wildwood,NJ
    Posts
    1,571

    Post

    I know your trying to help,but that chart is no comparison,20ftCentury 8.6 ft wide,4000lb,compared to a Grady W/A 23.6ft,and 9.6wide,over 7000lb,there 3000lb Difference,Plus the Difference in Prop,
    Murph,S.Philly,Williamstown,NJ.Wildwood,NJ

  10. #9
    Senior Member
    Join Date
    Oct 2005
    Location
    Lumberton, NJ .. Home Port: Mystic Island
    Posts
    226

    Post

    Here's a 20 ft century with a 2 stroke. Slightly better numbers.
    RPM MPH GPH MPG
    1000 5.1 2.3 2.22
    2000 8.3 5.2 1.60
    3000 23.3 6.7 3.48
    4000 33.2 19.8 1.68
    5000 41.2 23.2 1.23

    The numbers I just used to prove what he was trying to say above. If he wanted to spend a few hours looking at weight, prop pitch etc. He prolly wouldnt have asked here. But if you have the time check out http://www.yamaha-motor.com/outboard...px?ls=outboard

  11. #10
    Senior Member
    Join Date
    Jul 2001
    Location
    Cape May, NJ
    Posts
    5,251

    Post

    Originally posted by Luna-tik:
    If you dont have adobe acrobat here is the chart.
    Yammaha 150 4-stroke
    RPM MPH GPH MPG
    1000 4.5 0.8 6.00
    2000 7.2 1.9 3.79
    3000 19.3 4.0 4.81
    4000 31.8 6.6 4.82
    5000 39.4 10.3 3.84
    5500 43.2 14.0 3.10


    and the 150 2 stroke

    RPM MPH GPH MPG
    1000 5.5 3.2 1.72
    2000 8.3 6.4 1.30
    3000 14.5 10.9 1.33
    4000 33.35 14.1 2.37
    5000 41 21.3 1.93
    5600 47.4 30.2 1.57


    sorry about the format, I tried making it all nice to read, but it doesnt work.
    No way even a carb 2 stroke 150 is going to use 30.2 gph at WOT!!! That boat has to be twins. Rule of thumb for gas engines
    8 hp per gal per hour at WOT for gas carbed 2S outboard motors
    150 hp would be about 15-18 gph WOT
    10-12 hp per gph for fuel inj gas
    18 hp per gph for diesel

    I just went back to the test boat, a grady 232 Gulfstream. That is a twin 150 boat or big single boat.

    [ 11-24-2005, 09:31 AM: Message edited by: High Wire ]
    Archie / High Wire in the BZL,CMNJ and SW FL
    Monitoring the BBC (The Bass Barn Channel 78)
    TheBassBarn Reef Program
    2008 Duke of Fluke 1st Place 31.6 pounds!

  12. #11
    Senior Member
    Join Date
    Feb 2005
    Location
    Mile Marker 25 on Rt 47
    Posts
    5,580

    Post

    You can take these charts that are posted on web sites and books and throw them out the window. They are known to be off up to 15%. Yes it is a starting point but there is a pretty good chance you will not receive these numbers. There are so many factors that change these numbers. Just something as simple as 5 deg. in temps will change it.

    [ 11-24-2005, 09:47 AM: Message edited by: barnaclebillsmarine ]

  13. #12
    jmh
    jmh is offline
    Senior Member
    Join Date
    Apr 2005
    Location
    Vineland, NJ
    Posts
    111

    Post

    i have twin 150 yams. cruising at 3200 rpms im burning 7.1 according to the flow master. so double that for the twins. dont know how accurate though.

  14. #13
    jmh
    jmh is offline
    Senior Member
    Join Date
    Apr 2005
    Location
    Vineland, NJ
    Posts
    111

    Post

    by the way there 1996 salt water series. the run great (just ask jawz, he just puy new water pumps in them) can get approx. 12 trips back and forth to the rips and around the bay. approx. 200 miles on 200 gals of fuel.

  15. #14
    Banned
    Join Date
    Jan 2005
    Location
    cape may nj
    Posts
    2,690

    Post

    Originally posted by jmh:
    i have twin 150 yams. cruising at 3200 rpms im burning 7.1 according to the flow master. so double that for the twins. dont know how accurate though.
    that's correct....for carb'd 2 stroke outboards use the 10% rule-see my above post on this....a 150hp carb'd 2 stroke will NEVER burn 30 gph twin 150's will not a single....check your source....

  16. #15
    Banned
    Join Date
    Jan 2005
    Location
    cape may nj
    Posts
    2,690

    Post

    Originally posted by jmh:
    by the way there 1996 salt water series. the run great (just ask jawz, he just puy new water pumps in them) can get approx. 12 trips back and forth to the rips and around the bay. approx. 200 miles on 200 gals of fuel.
    that's right !! you've got a super clean well kept rig !!

Page 1 of 3 123 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •