yamaha 30 HP vs 28HP powerhead

Discussion in 'Outboards' started by AlanFord, Feb 27, 2009.

  1. AlanFord
    Joined: Sep 2007
    Posts: 1
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: South Africa

    AlanFord Alan Ford

    Good day ladies and gentlemen
    I would like to know if the cylinder block for an old model 689 30AE
    is the same as for what appears to be a very similar 28 HP motor.
    Was the difference in HP rating as a result of compression rating or a different throw on the crank? or was there a difference in the bore?
    I am trying to restore the 30hp motor but there are apparently some cracks in it. I have access to a 28HP block which i would like to use if possible
    thanks
    Alan Ford
     
    AlanFord, Feb 27, 2009
    #1
Loading...
Similar Threads
  1. martin de Ridder

    Yamaha 25A (648) 1972-1979 Wiring

    martin de Ridder, Jun 8, 2021, in forum: Outboards
    Replies:
    1
    Views:
    2,269
    Mr Efficiency
    Jun 8, 2021
  2. ionutfg

    Piston for Yamaha 5bs 661 5hp 2 stroke 1970 ?

    ionutfg, Mar 20, 2020, in forum: Outboards
    Replies:
    7
    Views:
    4,441
    ian73
    Apr 25, 2020
  3. Steve W

    converting a yamaha 9.9 four stroke to 15hp?

    Steve W, May 18, 2019, in forum: Outboards
    Replies:
    18
    Views:
    20,056
    2senko6
    May 11, 2021
  4. brett crowley

    2012 Yamaha 200 trim problems

    brett crowley, Jun 23, 2018, in forum: Outboards
    Replies:
    0
    Views:
    1,726
    brett crowley
    Jun 23, 2018
  5. Padmack

    Yamaha 5BS L661 Owners/Repair Manual

    Padmack, Jun 5, 2018, in forum: Outboards
    Replies:
    3
    Views:
    13,723
    activated
    Aug 15, 2018
  6. xellz

    Any noticeable difference between Yamaha, Honda, Suzuki, Tohatsu 20-30hp engines?

    xellz, Feb 21, 2018, in forum: Outboards
    Replies:
    6
    Views:
    21,595
    PAR
    Feb 26, 2018
  7. LowelandSystem

    25 HP yamaha 2 stroke

    LowelandSystem, Sep 24, 2016, in forum: Outboards
    Replies:
    4
    Views:
    2,463
    LowelandSystem
    Sep 25, 2016
  8. raf pali

    Power tilt failure. FT9.9G Yamaha 2008

    raf pali, Aug 7, 2016, in forum: Outboards
    Replies:
    0
    Views:
    2,059
    raf pali
    Aug 7, 2016
  9. Padmack

    Yamaha Outboard Remote Control

    Padmack, Jul 21, 2016, in forum: Outboards
    Replies:
    4
    Views:
    6,285
    PAR
    Jul 30, 2016
  10. winters

    Yamaha alternative ways for reading out sensors?

    winters, May 10, 2016, in forum: Outboards
    Replies:
    2
    Views:
    1,935
    CDK
    May 20, 2016
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.