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  1. Replies
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    Yes they do. The 15" Yamaha trim units were used...

    Yes they do. The 15" Yamaha trim units were used on a few Yamaha models and are pretty popular for adapting to a bunch of relevant motors..
  2. Replies
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    9,206

    Yes, yes we do. If anyone is interested in...

    Yes, yes we do. If anyone is interested in racing in Southern Ontario, please get in touch!

    We do have a 50hp Tohatsu powered T750 boat somewhere amongst the racers. Wish we had more boats with...
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    http://www.boatracingfacts.com/forums/showthread.p...

    http://www.boatracingfacts.com/forums/showthread.php?13631-yamaha-70-ces&p=116031&viewfull=1#post116031
  4. I was thinking about how to do this the other...

    I was thinking about how to do this the other day..
    I need a signal/trigger that is TDC, so I can compare it to the ignition timing trigger.
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    GearPros gears for OMC SST60 and Nitro

    Has anyone tried these out?

    Any comments / reviews / thoughts?

    https://gearprosinc.com/shop/ols/products/sst60-3
  6. Replies
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    Some more history related to this motor, and two...

    Some more history related to this motor, and two racers I wish I was able to speak to.

    75652
  7. Super Stock

    Here are some pics from assembling a short shaft from a long shaft. This was a few years ago. I'm adhering to our "Super Stock" racing rules. Basically the powerhead has to be stock, and/or built...
  8. All the 60hp models from around 1980/1981 came...

    All the 60hp models from around 1980/1981 came with the 1.71 "675" gears. 60A "675" and 60C "6F0" (the two I own, all original) as well as the 60D "6F1".

    Racers probably saw that due to the power...
  9. Yes, but only at a later date. It never came with...

    Yes, but only at a later date. It never came with 2:1 gears from the factory. The RYA homologation that includes the 2:1 gears clearly states those gears are from the 40F "679" model, and in fact...
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    One thing that came to mind with the E-tec blocks...

    One thing that came to mind with the E-tec blocks is whether or not the oiling locations from the oil injection are strategic in the design in such a way were you NEED to oil those locations in a...
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    This is the boat, motor, and driver that set the...

    This is the boat, motor, and driver that set the record shown in the first post in this thread:

    https://www.youtube.com/watch?v=hFUgbrZRakE

    Amazing that this video exists.
  12. Replies
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    Some more history regarding the 60D (6F1): The...

    Some more history regarding the 60D (6F1):
    The 60D (6F1) came with 1.85 gears from the factory (13:24). I'm guessing some racers lobbied to have the 13:26 gears from the 2cyl 40hp (679) officially...
  13. To clarify and correct for historical purposes,...

    To clarify and correct for historical purposes, the 60D (6F1) came with 1.85 gears from the factory (13:24). I'm guessing some racers lobbied to have the 13:26 gears from the 2cyl 40hp (679)...
  14. I recently re-read this whole thread and want to...

    I recently re-read this whole thread and want to clarify a few things I've found more recently.

    There are claims in this thread the 6F1/60DES tuner was dual horn - it is not - you can find pics...
  15. Replies
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    I had a great person help out and measure a new...

    I had a great person help out and measure a new old stock 6F1 piston, and as per speculation, the 60DES bores were 81.30mm for a displacement closer to 747 or 750cc..
    Stroke and rods are the same as...
  16. I had a great person help out and measure a new...

    I had a great person help out and measure a new old stock 6F1 piston, and as per speculation, the 60DES bores were 81.30mm for a displacement closer to 747 or 750cc..
    Stroke and rods are the same as...
  17. Replies
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    16,412

    Looks like the gaskets are the same part number....

    Looks like the gaskets are the same part number. For example - both 1983 60hp, and 2011 Etec 2cyl - same gasket.
  18. Replies
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    those screws holding the butterfly on do not look...

    those screws holding the butterfly on do not look factory stock
  19. Replies
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    Sometimes you can get an indication from...

    Sometimes you can get an indication from comparing the parts catalogs for both motors. Looks like the driveshaft top bearing is shared as well as the shims in that location, but the lower bearing...
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    I had brought 2 shafts in with me to get a quote,...

    I had brought 2 shafts in with me to get a quote, and it was approx 1.5 or 2 hours of shop time for both (approx $95 CAD per shaft). Turns out, for a single driveshaft, that's about half the price...
  21. Replies
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    8,950

    I had success finding a machine shop that...

    I had success finding a machine shop that specializes in gears and shafts. They shortened a couple drive shafts and matched the splines to the original. I did provide a spare crank to help them to...
  22. Replies
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    12,792

    I'm running a muffler and it is loud when...

    I'm running a muffler and it is loud when running. It is a stock 20" 3cyl 70 with a 2cyl lower. No mods, all original.

    Maybe no muffler affects the exhaust relief just below the lower cowl/pan...
  23. Replies
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    12,792

    The muffler doesn't matter as much as the actual...

    The muffler doesn't matter as much as the actual midsection "upper casing". It is the mid that has the baffles and exhaust outlet that determines the exhaust flow outlet location. It is also the...
  24. Replies
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    12,792

    So based on your two photos above, I have the...

    So based on your two photos above, I have the exact same configurations..
    You can see that some of the exhaust from the 70 3cyl mid will flow rearward of the baffle/wall between the two bolt holes,...
  25. Replies
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    12,792

    I run a 55/60 2cyl lower on a 70hp 3cyl. It is...

    I run a 55/60 2cyl lower on a 70hp 3cyl. It is also loud. I am pretty sure it is that the gearcase casing has a wall/baffle in a different location from the stock 70hp lower, does not line up with...
  26. Replies
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    Very similar, yes. not Exactly the same. Likely...

    Very similar, yes. not Exactly the same. Likely more differences between the 60D/60DE (6F1) and the regular 48/55/60 2Cyl than the differences between the 70CES (6J2) and the regular 70hp (6H3).
    ...
  27. Replies
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    Yamaha 60hp Wins British National

    1981
    69831
  28. Replies
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    14,078

    Incredible Yamaha 60D (1983)

    69830
  29. Replies
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    14,078

    Yamaha 60DES S750 UIM Speed Record 1986

    found this in an old Yamaha publication.

    69826
  30. Replies
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    Already done that. Also tried both partially...

    Already done that. Also tried both partially blocked inserts and stock inserts. Looking for peoples' opinions on the specifics in my original post. Wanna know what they've found trying various...
  31. Replies
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    Don't think our rules will allow that. ...

    Don't think our rules will allow that.

    Wondering mostly if people run with fully stock water pickup inserts, without a nose cone, and if they have any issues running the prop shaft high for a...
  32. Replies
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    bump. still looking for opinions.

    bump.
    still looking for opinions.
  33. Replies
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    I think the process will depend on what type of...

    I think the process will depend on what type of hub/spline configuration it has (in terms of how it is made/assembled)..
    If you can post a photo, or a part number we can use to look for a photo,...
  34. Replies
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    1996 60hp 52ci are WME-45 on the motor I can see...

    1996 60hp 52ci are WME-45 on the motor I can see with my own eyeballs.
    Looks like early 59ci are WME-58 for electric start 60hp, and WME-57 for the manual start 55/60hp, according to parts catalogs....
  35. After asking around and searching for info, I...

    After asking around and searching for info, I have a feeling that the 6F1 was unique in that the displacement was exactly 750cc - It had slightly smaller bore pistons than the very common 760cc 82mm...
  36. T-850

    OPBRA 2018 Peterborough Saturday T850 Race 1:
    https://www.youtube.com/watch?v=Wd0Xq06IInM

    OPBRA 2018 Peterborough Saturday T850 Race 2:
    https://www.youtube.com/watch?v=vZguMqzj2eY
  37. Deltas on the Crane:...

    Deltas on the Crane:
    https://www.youtube.com/watch?v=yJcMRYN_qZ8

    Ron, that's your prop on my Yamaha.
  38. Yes, the announcer was excellent all weekend! ...

    Yes, the announcer was excellent all weekend! Thanks Jordan!
  39. T-750

    Some T750 action from this past weekend. Two Deltas and a Critchfield, a Voodoo. Two OMC 45s and a Yamaha. Two of Ron's props? Maybe 3...?

    Saturday Race 1:...
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    In regards to these carbs (all Merc carbs for...

    In regards to these carbs (all Merc carbs for 2stroke midrange engines), are there specs available for venturi size and jetting based on the casting numbers, or based on the the dot-peen'd "WME##-#"...
  41. Replies
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    Yamaha 70 (small lower) Cooling..

    Hi,
    for those with experience running the small 70CES lower (or the 48/55/60hp 2Cyl lower) on either the 70 or the 2Cyl 55/60hp engines, I'm looking for suggestions:

    - run with or without a...
  42. Racing in Peterborough, Ontario: Sept 15th and 16th

    Racing in Peterborough, Ontario: Sept 15th and 16th, 2018.

    http://opbra.ca/

    Please contact OPBRA if you are interested in racing. Last OPBRA event had a fella come up from New York.
    Will be a...
  43. How To: Embed a YouTube video in your Post

    Use the opening and closing [YT] tags around the YouTube video ID:

    take the full URL from YouTube

    https://www.youtube.com/watch?v=gfVlI96pkao, ID is gfVlI96pkao in this example:

    gfVlI96pkao...
  44. Replies
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    Depends on the model year. Pre-1995, yes, 15 and...

    Depends on the model year. Pre-1995, yes, 15 and 20" power trim models have the same brackets an trim units.
  45. Replies
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    Can also use the Advanced Search to search by...

    Can also use the Advanced Search to search by username for your own username.
  46. Replies
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    Also curious to know what others use. I'm also...

    Also curious to know what others use. I'm also looking for more protection than a basic oil.
  47. Replies
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    What model yer is your motor? I have a 1996 60...

    What model yer is your motor?

    I have a 1996 60 (850cc, 1.64:1 gears) and installed Chris Carson Reeds this past winter. I notice no change at all in performance in any way. No more power up top;...
  48. Replies
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    I got a 11.25x18 thru-hub semi-cleaver from Ron...

    I got a 11.25x18 thru-hub semi-cleaver from Ron that has cupping inwards on the leading edge, only for the last 1/3 of the leading edge before the tip. My initial thoughts were that it didn't look...
  49. Not true. The original 3cyl 2-stroke 40/50...

    Not true. The original 3cyl 2-stroke 40/50 (700cc) lower is shorter in length and height, and has a smaller (diam) driveshaft. The casing will also not bolt up to a 70 (850cc) mid. The 70CES uses the...
  50. Replies
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    I was hoping there would be the possibility of...

    I was hoping there would be the possibility of using a 48/55/60 2Cyl driveshaft or a 70 driveshaft in a F50 gearcase to bolt right up to a 70, but it doesn't seem to be the case. The F50 drive shaft...
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