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  1. Replies
    12
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    1,634

    Only half of gearcase submerged to get maximum...

    Only half of gearcase submerged to get maximum speed
  2. Replies
    12
    Views
    1,634

    All homemade prop

    All homemade prop
  3. Replies
    12
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    1,634

    mostly homemade prop

    mostly homemade prop
  4. Replies
    12
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    1,634

    Info from engine builder 3hp approx = 42 mph...

    Info from engine builder

    3hp approx = 42 mph
    5hp approx = 38 mph

    Not sure why 3hp faster than 5hp
  5. Replies
    12
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    1,634

    Dean, Let me find out the approx speed of 3hp...

    Dean,

    Let me find out the approx speed of 3hp and 5hp

    71760
  6. Replies
    12
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    1,634

    Sarawak Borneo mate !!

    Sarawak Borneo mate !!
  7. Replies
    12
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    1,634

    3 hp & 5 hp class

    7174871749717507175171752717537175471755
  8. Replies
    8
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    832

    Yup, alive and keep booming

    Yup, alive and keep booming
  9. Replies
    8
    Views
    832

    Local Builder and design, not associated to UIM

    Local Builder and design, not associated to UIM
  10. Replies
    8
    Views
    832

    Borneo mate

    Borneo mate
  11. Replies
    0
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    281

    18hp class, Sarawak, Malaysia

    7163371634716357163671637716387163971639716407164171642
  12. Replies
    8
    Views
    832

    18hp class, Sarawak, Malaysia

    71623716247162571626716277162871629716307163171632
  13. Replies
    0
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    341

    15hp class , Sarawak , Malaysia

    716077160871609716107161171612716137160771614716117161571616
  14. Replies
    12
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    6,234

    Powerabout, What rules to comply for this...

    Powerabout,

    What rules to comply for this Asian Tour ?
  15. Replies
    9
    Views
    1,481

    40hp class 68423

    40hp class

    68423
  16. Replies
    9
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    1,481

    Roflhat, Solution was too simple then overlook

    Roflhat,

    Solution was too simple then overlook
  17. Replies
    9
    Views
    1,481

    Race all day long with engine no overheating...

    Race all day long with engine no overheating issue
    6842068421
  18. Replies
    9
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    1,481

    Mike, We successfully with this design since...

    Mike,

    We successfully with this design since 30 years ago , over 500 racers in our region did with this system , the whole ideal was only block the gas exit to the bearing carrier, seal the mouth...
  19. Replies
    9
    Views
    1,481

    Mike, We successfully with this design since...

    Mike,

    We successfully with this design since 30 years ago , over 500 racers in our region did with this system , the whole ideal was only block the gas exit to the bearing carrier, seal the mouth...
  20. Replies
    9
    Views
    1,481

    We submerged only half of the gearcase in the...

    We submerged only half of the gearcase in the water, Yes ! water flow up, however need some modification internally, seal the exit gas at bearing carrier, seal & block the gas passage at upper and...
  21. What power gain to be expect ?

    What power gain to be expect ?
  22. Replies
    9
    Views
    1,481

    Water Intake system

    New intake system for new project 30hp yamaha68418
  23. Hi Mike, I am working on research converting...

    Hi Mike,

    I am working on research converting Yamaha 30hp x 2 cylinders, also plan converting a 56 omc in future
  24. Stock convert to alcohol, mehanol / nitromethane

    Dearest All,


    What steps to consider if converting stock motor to pro = alcohol / methanol / nitromethane ?

    Regards,
    Dvd
  25. Replies
    27
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    14,655

    Zul8tr, year : 1990 stroke : 2 prop pitch :...

    Zul8tr,

    year : 1990
    stroke : 2
    prop pitch : winrace 4 blade x 18.5 pitch
    gear ratio: standard 1.84 ratio
    mod : copy of jimmy johnson mod c kilo record of 91 mph
    mod: shaving head, big bore...
  26. Replies
    27
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    14,655

    left : sst60, middle: mod 30hp, right...

    left : sst60, middle: mod 30hp, right : mod 40hp, 66220 back : sst60
  27. Replies
    27
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    14,655

    66218 fun time

    66218 fun time
  28. Replies
    27
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    14,655

    Jimboat , Malaysian local class named : " mod...

    Jimboat ,

    Malaysian local class named : " mod 30hp class "
  29. Replies
    27
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    14,655

    Jimboat ! Fun in term of ?

    Jimboat !


    Fun in term of ?
  30. Replies
    27
    Views
    14,655

    Hi Jimboat, Question: what is the possibility...

    Hi Jimboat,

    Question: what is the possibility of flipping for 11 footers tunnel boat with 30hp yamaha at speed 81.3mph for flat water and 83.7mph (GPS) for slight choppy ?

    Regards,...
  31. Replies
    2
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    2,146

    Mini Boat - Smallest Hp

    We also race the smallest 2hp631286312963130
  32. Replies
    1
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    1,863

    Mini Tunnel Boat

    Mini Tunnel63117
  33. Replies
    4
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    1,003

    I just need the gears for spares

    I just need the gears for spares
  34. Replies
    4
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    1,003

    My question is this nitro lower not the bolt

    My question is this nitro lower not the bolt
  35. Replies
    4
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    1,003

    Nitro Identificaion

    Can anyone confirm if this is nitro lower with 15:28 gears ?6309763098
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