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  1. #16
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    That 220 special was a great engine in its time... I loved mine...
    Best to get that YMIS module (computer) from the guys that offered... Best keep that motor as it came out of the factory... If you really want to convert to mechanical advance, you only need to replace the trigger and add the linkage just like a 200... Stator, powerpack and coils are the same except for coil mount location... I think if you remove YMIS bracket, you can still mount coils to exhaust cover...

  2. #17
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    Agree, keep the motor exactly as the factory intended it and you will be very happy if it is as clean as you say. Most folks don't know what a 220 Special is. You already have one lead for the computer and if that does not work out, get the SN# off the motor and try Hydro-Tec. Those guys seem to know where old stuff is and certainly know the older Yamaha's. I had one years back on a boat I bought in Arizona. I didn't care about the motor on the back. When I got the boat in, Ray N (RIP) helped me ID what the heck the motor was and in fact it was a 1985 220 Special on a 1987 hull. The motor was 100% original and ran like a top 30 years later. Go figure. Had some big ol 34mm carbs I believe. I had it for a year and then took on a bad load of fuel one day and blew it up. I think they also have some kinda special gear case, but I may be wrong on that part of it. Post some pics if you have them of the 220 Special. Here is the ad from 1984 when Yamaha broke into the USA. Evidently it was all about to change for Mercury
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  3. #18
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    1984, merc and omc were selling everything they could make, nothing to worry about was there.
    Last edited by powerabout; 04-26-2015 at 09:19 AM.

  4. #19
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    I am ready to get this engine going! It is sitting on my dad's 21 ft baker bass boat, tunnel hull. I want to see how the boat runs!

  5. #20
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    Quote Originally Posted by Greg G View Post
    Had some big ol 34mm carbs I believe.
    Different carbs than on subsequent Yamaha models, which got Nikki carburetors.

    Quote Originally Posted by Greg G View Post
    I had it for a year and then took on a bad load of fuel one day and blew it up.
    The tight heads made it sensitive to low octane fuel.

    Quote Originally Posted by Greg G View Post
    I think they also have some kinda special gear case, but I may be wrong on that part of it.
    I think it had a taller gear ratio than subsequent models, and the gear case might be shorter, too.

    Quote Originally Posted by Greg G View Post
    Evidently it was all about to change for Mercury
    Mercury and Yamaha had tried to rule the world together through the Sanshin JV. When that was stopped due to anti-trust issues, Yamaha entered the market on its own.

    Mercury understood what was coming, though, and slowly shaped up. Customer loyalty and a strong dealer network allowed it to buy time.

    The big loser was OMC which went bankrupt 15 years later.
    Markus' Performance Boating Links:
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  6. #21
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    Click image for larger version. 

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  7. #22
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    Click image for larger version. 

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    Here are some pictures of the connectors computer (YMIS) and the connectors.
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  8. #23
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    What did Hydro-Tec have to say?

  9. #24
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    I have not talked to Hydro-Tec yet. I am waiting to hear back from some of the members to see if their computers are good and whether they have the right connections.

    I just thought I would post some pics of the motor and YMIS as well.

  10. #25
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    Quote Originally Posted by Markus View Post
    Different carbs than on subsequent Yamaha models, which got Nikki carburetors.



    The tight heads made it sensitive to low octane fuel.



    I think it had a taller gear ratio than subsequent models, and the gear case might be shorter, too.



    Mercury and Yamaha had tried to rule the world together through the Sanshin JV. When that was stopped due to anti-trust issues, Yamaha entered the market on its own.

    Mercury understood what was coming, though, and slowly shaped up. Customer loyalty and a strong dealer network allowed it to buy time.

    The big loser was OMC which went bankrupt 15 years later.
    The gearcase was the same I think but it had a short prop shaft and like a 1.80 ratio. It's got a knock sensor so they weren't too sensitive to run 89 or even 87...but premium would be the choice wherever possible.

    Mercury really got caught with their pants down when Yamaha took the lead in the 4stroke market. They are still buying boat companies to try to keep from losing more market share...
    '08 SRV
    Yamaha 3.1 Phase III


  11. #26
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    It would be interesting to know what the MSRP was for the 220 Special back in 1984.

  12. #27
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    It says Made in Japan on the plate.
    Markus' Performance Boating Links:
    www.toastedmarshmallow.com/performance

  13. #28
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    Quote Originally Posted by Markus View Post
    It says Made in Japan on the plate.
    I saw that! I just relayed the information that I was told by them!

  14. #29
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    If they made them in Australia they couldnt have dumped them below cost everywhere so easily...
    Give them their due they took the smart road on the new propshaft horsepower rating so that in 84 a 115 yam went as good as a 140 Merc and OMC and they made control boxes that every boat builder and dealer wanted not to mention full shift LH gearboxes.

  15. #30
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    I have a 1986 V6 Special. The powerhead is original, never been apart and still running like the day it was built. Rick, you were close, the 86 had a lower ratio of 1.73, but the propshaft is the same length as any other 2.6 case that I have seen. I am trying to modify a new SHO gearcase to fit the old girl. The SHO ratio is 1.75.
    Last edited by RFCB; 04-30-2015 at 08:43 PM.

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