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Thread: Building a Super Mod 2 cylinder Mariner/Yamaha

  1. #21
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    Does anyone know what one of these twin Yamaha power heads weigh?

    Jeff

  2. #22
    Team Member WalkWithMax's Avatar
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    Default cool thread!

    Don, You may have to hook me up with one of these for next year! Or maybe I will still go with my '74 OMC 50 sizzler? My 50 has different pistons than the newer motors. The top ring is very close to the top of the piston. The motor is in great great shape, and I installed new rings, but I wonder if it will make decent power or not? Any thoughts on the older 44ci vs the newer 2cyl 50's and 60's?

  3. #23
    modifiedoutboard OUTBOARDER's Avatar
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    Default 45ss vs d mod merc

    Quote Originally Posted by WalkWithMax View Post
    Don, You may have to hook me up with one of these for next year! Or maybe I will still go with my '74 OMC 50 sizzler? My 50 has different pistons than the newer motors. The top ring is very close to the top of the piston. The motor is in great great shape, and I installed new rings, but I wonder if it will make decent power or not? Any thoughts on the older 44ci vs the newer 2cyl 50's and 60's?
    the pic of the white boat $500, 200lbs old pro did beat 2003 APBA short course nat and AOF nat winner from behind 3 heats at Camden NC oct 2003. There are a couple d mods out there that are faster than we were back then but not with punch out of turn. That power head blew 225 psi on the comp gauge! John Runne said the throttle was like a light switch
    on or off.
    Attached Images Attached Images  
    ANTHONY McCULLOCH
    modifiedoutboard@hotmail.com

    Some things never change!

    They Want it cheap..............

  4. #24
    Sam Cullis Mark75H's Avatar
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    To me when it came on the pipe it felt like suddenly being kicked by an elephant ... and that was before it was "right"
    Since 1925, about 150 different racing outboards have been made.


  5. #25
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    Default Here is a new old stock 15 inch mid. Also fits the 90 hp Yamaha

    http://www.ebay.co.uk/itm/YAMAHA-MAR...item58914982f9

    DRIVE SHAFT HOUSING
    FOR 55 / 60 H.P.
    STD SHAFT ( SHORT)
    LATE '70, 80 & 90
    2 CYL ENGINES
    ALSO FIT SOME MARINER 55 / 60 HP
    NEW OLD STOCK

    Yamaha part no : 687-45111-00

    Mariner part no: 1587-7163M

  6. #26
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    Default Sold!!

    Quote Originally Posted by hounddog View Post
    http://www.ebay.co.uk/itm/yamaha-mar...item58914982f9

    drive shaft housing
    for 55 / 60 h.p.
    Std shaft ( short)
    late '70, 80 & 90
    2 cyl engines
    also fit some mariner 55 / 60 hp
    new old stock

    yamaha part no : 687-45111-00

    mariner part no: 1587-7163m
    That did not last long!

  7. #27
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    Is anyone got on to building one?
    Here is a very nice stock one. Great platform for the mod!

    http://www.ebay.co.uk/itm/YAMAHA-60h...item1c25e886e6

  8. #28
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    seen a lot of these motors around and had no idea there capable of so much power

  9. #29
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    Time to refresh this old thread. We should be able to get more first hand information with the resent replies on the T850 thread. Since 2012 this is what we have found out. Again this thread is all about the yamaha 60 D 2 cylinder model.
    [1] I got a number of blocks. There is two different blocks for sure and maybe 3.
    [2] there are at least 2 different heads. They even have different bolt patterns and gaskets.
    [3] the last model of the 55 yamaha has a different block compared to the mid 80's mariner.
    [4] Mark at Tuff boats tested a 55 hp yamaha on his Tuff 16 and got poor performance.

    Question is: We know that these motors and the Nissan 2 cylinder model raced as a class in Japan on 12 foot tunnels and ran high 80 mph.
    We now know that in 1988 a T boat with a 60 D Yamaha was running mid 70s mph. Why can't we get the same performance? What was different about those motors?

  10. #30
    Sam Cullis Mark75H's Avatar
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    Quote Originally Posted by Hounddog View Post
    Question is: We know that these motors and the Nissan 2 cylinder model raced as a class in Japan on 12 foot tunnels and ran high 80 mph.
    We now know that in 1988 a T boat with a 60 D Yamaha was running mid 70s mph. Why can't we get the same performance? What was different about those motors?
    The boat and the prop
    Since 1925, about 150 different racing outboards have been made.


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