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  1. They did. Older Mariner 60hp (I have one in...

    They did. Older Mariner 60hp (I have one in hand), and I think the newer 50G 850cc 50hp in the UK.
  2. New parts for a short Yamaha 3cyl 70 are still...

    New parts for a short Yamaha 3cyl 70 are still available, but you'd have to piece it together.. Buying these parts new isn't very cheap.
    Start with a 20in 70hp, find a used 55hp small lower unit,...
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    design change without part number change

    72223

    original 1980 on left (60hp 45ci), original 1990 on right (40hp 45ci).

    Ok, so it looks like the 5006655 & 5006665 part numbers are piston+ring kits. So at this point I'm just wondering if...
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    72221 72222

    72221

    72222
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    I was going on the assumption that they are the...

    I was going on the assumption that they are the same. 1980 60hp 2cyl parts catalog lists the same part numbers (original older part numbers) as the SST45 parts book on SeaWay's site.

    72219
    ...
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    Can someone clarify which pistons are legal? ...

    Can someone clarify which pistons are legal?

    A buddy of mine ordered the 5006665 part from Sea-Way and the pistons in the box were marked with 391417. Parts books list the original part number...
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    Many kinds of piston designs for the 49ci.. Far...

    Many kinds of piston designs for the 49ci..
    Far left is the 3 ring 1968 55hp, far right is the 1975hp Stinger piston (high top ring, flat top).
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    11,780

    factory exhaust port chamfers

    Old thread, I know.., but wanted to add this as I had not found pics of these details online..

    I've been searching for photos of this for a while and finally got to see it first hand (thanks...
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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...
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    905

    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...
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    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...
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    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...
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    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,...
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    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...
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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).
    ...
  17. Replies
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    Yamaha 60hp Wins British National

    1981
    69831
  18. Replies
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    Incredible Yamaha 60D (1983)

    69830
  19. Replies
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    Yamaha 60DES S750 UIM Speed Record 1986

    found this in an old Yamaha publication.

    69826
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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...
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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...
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    bump. still looking for opinions.

    bump.
    still looking for opinions.
  23. 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,...
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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....
  25. 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...
  26. 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
  27. Deltas on the Crane:...

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

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

    Yes, the announcer was excellent all weekend! Thanks Jordan!
  29. 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##-#"...
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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...
  32. Relating to Sanders and Wooldridge, taken from...

    Relating to Sanders and Wooldridge, taken from this article:
    http://www.fiberglassics.com/library/index.php?title=G-W_Invader_History

    "
    Meanwhile, George spent this time working with Bob Sanders...
  33. Thanks Jim! I just did a quick search of HPBC.ca...

    Thanks Jim! I just did a quick search of HPBC.ca and found this thread where you and others discuss Dunnville 1986 and the Delta boats. Appreciated. thanks.
    ...
  34. 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...
  35. 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...
  36. found some more info here:...

    found some more info here:
    http://www.boatracingfacts.com/forums/showthread.php?16509-DP-Class


    and again, nothing definitive, but another photo:...
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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.
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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.
  39. Still looking for more info. If anyone has any...

    Still looking for more info. If anyone has any details to add, please post them up. I've been racing this hull this season and so far it turns quite a bit better than the Voodoo I ran last year. ...
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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.
  41. Looking for History regarding the Delta 13ft v-bottom race boat (FE, T-Boat) Xcalibur

    Hi,
    Known here in Ontario as a Delta. I have also seen them called Xcalibur or Excalibur in the south.
    If anyone knows the origins of this hull, post up what you know. I'm trying to compile the as...
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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;...
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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...
  44. 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...
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    I believe the main difference between the 40 and...

    I believe the main difference between the 40 and 50 are the exhaust tuner and carbs. So look for 6H5 vs. 6H4 on those parts (tuner is hard to get to). I just looked at 1993 Pro50 carbs and they are...
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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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    That looks like a 3cyl 40/50 gearcase. Hounddog...

    That looks like a 3cyl 40/50 gearcase. Hounddog says that may also fit the Yamaha 3cyl 30. Also, it looks like it is pre-1995 (like my 1993).

    The one we are talking about will have a rotating...
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    I was looking in to this too and from studying...

    I was looking in to this too and from studying photos of the F50 driveshaft and the spline holder tools for the F50, it looks like the top of the F50 driveshaft is the smaller 40/50/Pro50 size. That...
  49. I was not thinking OMC at all. Yamaha 2Cyl 55 /...

    I was not thinking OMC at all. Yamaha 2Cyl 55 / Mariner 60 vs. Yamaha 700cc 50. Of those two, what would run better in T750..?
  50. I'd be interested to see if this 2Cyl outperforms...

    I'd be interested to see if this 2Cyl outperforms a 3cyl 700cc 50hp. Both in stock form and just with basic mods like larger carbs, clean up the ports, mild exhaust tuner.
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