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  1. Thread: Tohatsu M50D2

    by Roflhat
    Replies
    9
    Views
    974

    definitely a couple of finger ports in there ;)

    definitely a couple of finger ports in there ;)
  2. Thread: Tohatsu M50D2

    by Roflhat
    Replies
    9
    Views
    974

    Must be possible to fit some V force reeds in...

    Must be possible to fit some V force reeds in there? I know the tohatsu the reed blocks are very small, V force style would give you more area if you can fit them in
  3. Replies
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    1,538

    Haven't tried the new style but the old rubber...

    Haven't tried the new style but the old rubber hub ones were more desirable. Not sure if there's actually any difference in blade profiles
  4. Agree with mike, and try not to keep the engine...

    Agree with mike, and try not to keep the engine at a fixed RPM for too long, when you're at 2000 rpm just move the throttle up and down slightly to vary revs
  5. Replies
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    11,499

    That's seriously cool!

    That's seriously cool!
  6. Replies
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    11,072

    Not got photos of it back, those just came up on...

    Not got photos of it back, those just came up on my facebook. They belong to a guy called Michael Graves in New Zealand
  7. Replies
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    11,072

    https://i.ibb.co/DzC0Fkv/48423154-2084714748240790...

    https://i.ibb.co/DzC0Fkv/48423154-2084714748240790-2900687248041181184-o.jpg
    https://i.ibb.co/jDY016J/48430279-2084714878240777-4814422089844916224-o.jpg
  8. Replies
    11
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    11,072

    https://i.ibb.co/Y23t4ZZ/238844.jpg...

    https://i.ibb.co/Y23t4ZZ/238844.jpg
  9. Replies
    11
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    11,072

    Seen a few photos, can't find them now though!...

    Seen a few photos, can't find them now though! Here's a link to some https://www.geckotrailers.co.uk/single-axel-to-750kg/thunder-cat-and-zapcat-trailer
  10. Thread: Transom wedge

    by Roflhat
    Replies
    4
    Views
    3,916

    You get special wedges for that -...

    You get special wedges for that - https://www.specialistsmallcraft.co.uk/products/outboard-transom-wedges
    Not sure if they’d fit your engine but worth asking
  11. Replies
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    2,905

    That's a really neat solution, like that a lot

    That's a really neat solution, like that a lot
  12. Replies
    31
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    14,633

    looking good

    looking good
  13. Replies
    15
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    11,979

    Aquarius quality isn't so great, they fall apart...

    Aquarius quality isn't so great, they fall apart after a few years but they are probably the fastest thundercats out there. Ceasar build quality is good, as is Infanta, I've been impressed with both....
  14. Replies
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    1,328

    They should spin silently and with no play, it's...

    They should spin silently and with no play, it's usually fairly obvious when they've gone, they deteriorate quickly and make a lot of noise
  15. Replies
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    780

    70ces Exhaust Flange Dimensions

    Does anyone have the dimensions for the exhaust flange on a 70CES?
    https://preview.ibb.co/mb2uTH/IMG_5815.jpg
  16. Replies
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    677

    70ces Exhaust Flange Dimensions

    Does anyone have the dimensions for the exhaust flange on a 70CES?
    https://preview.ibb.co/mb2uTH/IMG_5815.jpg
  17. Replies
    12
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    4,258

    I don't mean shimming it so the gears are too...

    I don't mean shimming it so the gears are too close together, just taking the tolerance closer to what it should be from factory.

    Hey Jake, lapping looks like the way to go thanks mate. Did...
  18. Replies
    12
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    4,258

    Alright, I've never tried shimming the gearbox...

    Alright, I've never tried shimming the gearbox but heard you can shim it tighter to gain some rpm. Not sure if there's much to be gained by balancing the gears seen as the diameter is relatively...
  19. Replies
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    4,258

    I meant I can't add anything such as lwp or a...

    I meant I can't add anything such as lwp or a bullet point.
    The gearbox works fine but shimming it to reduce the tolerance can help reduce friction. There's regulations for the bullet and skeg...
  20. Replies
    12
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    4,258

    Standard Yamaha 70ces gear case, can't change the...

    Standard Yamaha 70ces gear case, can't change the shape of it by adding lwp or point etc. Was going to balance the gears and re shim the gearbox at the same time
  21. Replies
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    4,258

    Hi Jeff, I'd heard of that being done, not tried...

    Hi Jeff, I'd heard of that being done, not tried it but I might try some back to back tests to see how it performs
    cheers
  22. Replies
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    4,258

    Gearcase Blueprinting

    Wondering what folk do to their gearcase to improve performance?
    Was thinking of stripping all the paint off as it's quite thick and putting on one thinner coat. It's used it salt water or else I'd...
  23. Replies
    27
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    5,582

    I would avoid the cleaver shape if you're running...

    I would avoid the cleaver shape if you're running the prop fully submerged. The more blade area you remove the less pitch the prop will have
  24. Replies
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    3,859

    Couple good props here -...

    Couple good props here - https://www.facebook.com/forgemarine
  25. Thread: Nissan NS40D2

    by Roflhat
    Replies
    11
    Views
    3,882

    You can read my build thread with my old tohatsu...

    You can read my build thread with my old tohatsu 50, we get 63.6mph with that motor now on a thundercat with an 18p Mercury Chopper -...
  26. Thread: Nissan NS40D2

    by Roflhat
    Replies
    11
    Views
    3,882

    If it's the same as the Tohatsu 50D2 which I...

    If it's the same as the Tohatsu 50D2 which I believe it is, rev limiter comes in at 5850. The crank shaft is pressed, it's generally not recommended to remove the rev limiter without welding the...
  27. Replies
    370
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    74,799

    That's fast now!

    That's fast now!
  28. Replies
    15
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    11,979

    There's a guy with a 90 short in Aus, he's still...

    There's a guy with a 90 short in Aus, he's still tuning it but says it works well. I'm tuning my 70ces, still some work to do but at 67mph just now. I don't believe anyone has had 80mph out of one of...
  29. Replies
    370
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    74,799

    Cool build :cool:

    Cool build :cool:
  30. Thread: yamaha 70 ces

    by Roflhat
    Replies
    36
    Views
    11,500

    Always liked that phrase, the costs seem to...

    Always liked that phrase, the costs seem to increase exponentially the faster you go, I only paid 750 for the engine, the porting + other mods were 1200



    There's only 1 fuel pump on the...
  31. Thread: yamaha 70 ces

    by Roflhat
    Replies
    36
    Views
    11,500

    haha, its hard to go fast for cheap!

    haha, its hard to go fast for cheap!
  32. Thread: yamaha 70 ces

    by Roflhat
    Replies
    36
    Views
    11,500

    I run super unleaded here in Scotland, 97 RON

    I run super unleaded here in Scotland, 97 RON
  33. Thread: yamaha 70 ces

    by Roflhat
    Replies
    36
    Views
    11,500

    Hey Fred, after all round power, engine is...

    Hey Fred,

    after all round power, engine is ported with 90hp carbs. The TSR head ive got has removable chambers so I could draw up some new ones and have them CNC'd
    I've heard 34cc is decent, TSR...
  34. Thread: yamaha 70 ces

    by Roflhat
    Replies
    36
    Views
    11,500

    Anyone have experience testing different CC head...

    Anyone have experience testing different CC head chambers on the ces?
  35. Replies
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    14,633

    I think they're the same diameter, just different...

    I think they're the same diameter, just different jetting. The jets in the 60 carbs might even suit you better
  36. Replies
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    14,633

    Looks really sharp in blue!

    Looks really sharp in blue!
  37. Wouldn't have thought a bigger powerhead would...

    Wouldn't have thought a bigger powerhead would fit under a 50hp cowl, I suspect it's just a tuned 50hp
  38. That's a really smart looking solution, nice work!

    That's a really smart looking solution, nice work!
  39. Does anyone know of any smaller lower units that...

    Does anyone know of any smaller lower units that will fit the 70ces? It's quite a lot bigger than the 50hp, I think you could fit a 14" diameter prop on the 70

    Also maybe worth thinking about a...
  40. Replies
    9
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    5,624

    i believe the F50 gearbox will fit the 70, it...

    i believe the F50 gearbox will fit the 70, it fits the 70ces, have a look here - http://www.thundercatinflatable.com.au/forum/showthread.php?3493-70CES-Yamaha-Infanta-Thundercat-Build
  41. Replies
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    1,606

    12 Spline Propellers?

    Anyone know what motors use 12 spline props? Any 75hp OMCs?
  42. Replies
    89
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    49,211

    I can't believe that you would get near 3...

    I can't believe that you would get near 3 cylinder (70ces) performance from a 2 cylinder. When you're tuning the 3 cylinders it's extremely effective because the cylinders are 120 degrees apart,...
  43. Replies
    2
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    2,103

    The closer your gear ratio to 1:1 the smaller...

    The closer your gear ratio to 1:1 the smaller diameter prop you require (more RPM less torque). Bigger diameter is more efficient in terms of prop slip.
  44. Replies
    2
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    2,057

    Managed to get a copy of them from a CES book,...

    Managed to get a copy of them from a CES book, any tips and advice on timing are always welcome though!
  45. Replies
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    57,321

    I second this, if Jake tests a prop and says it...

    I second this, if Jake tests a prop and says it works on SLT's you'll sell a bunch of them
  46. Is there any reason you would lighten the crank...

    Is there any reason you would lighten the crank instead of the flywheel?
  47. Replies
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    2,057

    Yamaha 70 timing

    Anyone got timing link lengths for a yamaha 70? Or if someone with a yam 70 could take photos of the timing links so I can get an idea of the lengths that would be much appreciated

    cheers
  48. Replies
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    9,733

    Thanks Tim, Seems to be the general consensus -...

    Thanks Tim,
    Seems to be the general consensus - not as stiff as stainless but better than brass.
  49. Replies
    37
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    9,733

    Regarding material, does anyone have any...

    Regarding material, does anyone have any experience with Aluminium Bronze/NiBrAl? Seems a lot of companies prefer to offer this for casting as opposed to stainless. The strength and hardness figures...
  50. Replies
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    9,733

    Fantastic, thank you very much! sent you a PM

    Fantastic, thank you very much! sent you a PM
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