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Thread: Building a Super Mod 2 cylinder Mariner/Yamaha

  1. #51
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    I did reply to your private messages. The two motors you have are different and I am surprised you got 6F0 parts and gaskets easily. Good for you. The exhausts are different. One is the single piece and the other 6F0 has a pipe and outer shell.
    The 6FO has different Pistons. The other one is much more common and similar to the newer Yamaha 55 parts.

  2. #52
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    Name:  8DE18D7F-3F90-4BF4-85B5-BEC4E93C598F.jpg
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Size:  246.5 KBHi there all just come across this forum and this post so thought I’d sign up I’m currently having a 60de 6f1 rebuilt and advise on mods would be much appreciated
    Likes hydrospeed77 liked this post

  3. #53
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    Quote Originally Posted by Supremesoundzuk View Post
    Name:  8DE18D7F-3F90-4BF4-85B5-BEC4E93C598F.jpg
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Size:  246.5 KBHi there all just come across this forum and this post so thought I’d sign up I’m currently having a 60de 6f1 rebuilt and advise on mods would be much appreciated
    IF? Yours is an original 60de you already have the best model. Your motor has all the good parts. Please post pictures and port measurements. We have never seen the inside of an 6f1 powerhead. Thanks for posting.

  4. #54
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    I beleive so yes it’s currently being completely stripped leg and bracket bead blasted and any repairs and painted, power heads stripped and being chemically dipped ready for a full rebuild

    The plan is some mild port work and head work and have the crank rods and flywheel balanced we don’t have any rules on mods,

    If anyone has any suggestions feel free to comment

  5. #55
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    Bracket pic

    Name:  46507231_2055786944696427_6372322563372089344_n.jpg
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    Last edited by hydrospeed77; 11-20-2018 at 02:03 PM.

  6. #56
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    Here's is what WE know about the twin Yamahas.
    - in the late 1970's to early 1980's Yamaha made the displacement larger
    - the block was the 6F0 ....60C Yamaha....60E Mariner
    - it was still 60 hp at the crank same as the smaller displacement version.
    - the 60D with the 6F1 block was produced in 1981-2
    - the 60D had the special tuner, maybe larger carbs, porting change?, head change? piston change?
    We have never seen a 6F1 block disassembled so that information would be good to know.
    - Yamaha when BACK to the smaller displacement block after 1983 and the motor uses the same sleeve,
    rod and piston as the 90 hp 3 cylinder models.
    - parts for the 6F0 powerhead are hard to find...the 6F1 must be harder to find.
    - we know it is very easy to get 120 plus hp out of the 90 hp yamaha.
    - the difference between the 90 and the twin is the cylinder head dome.
    - a twin with the same style head SHOULD be 2/3 the hp of the 90 hp.
    -with the same mods as the 90, the small displacement twin should make over 75 hp
    - the 6F1 was said to produce approximately 65 hp

  7. #57
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    I canít get some measurements il ask my guy

    Mine is yes fitted with a trumpet style tuner al be it relitively battered
    Name:  46479963_614680882268652_6930260655031189504_n.jpg
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    Iíve had some 3D printed velocity stacks
    Name:  46500986_527923724356571_7187768168041938944_n.jpg
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    The part number on my carbs is 66323 which is a little confusing but the air jet is larger than any listed at 180 I donít know what the main jets are itís not that far apart yet
    Last edited by hydrospeed77; 11-20-2018 at 02:58 PM. Reason: added photos

  8. #58
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    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 bore engines. I can't fully confirm that but I have a strong feeling that was the case based on part numbers and measurements of pistons.

    The 6F0 has 84mm pistons for 798cc.

    My guess is that all of them share the same crank and are 72mm stroke.

    I noticed in some photos, the 663 Cyl Head is different from the common 675 Cyl Head, and looks like the 663 Air Box is smaller than the late 70s' Mariner 60 and mid-90s' Yamaha 55.

    I've now seen photos of 3 different flywheel designs. 4 if you count the 6F0, which has different Flywheel, Stator, CDI than the most common newer Yamaha 55hp and older Mariner 60hp.
    Last edited by hydrospeed77; 11-22-2018 at 07:43 AM.

  9. #59
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    Question

    Quote Originally Posted by Supremesoundzuk
    full rebuild
    How have you made out with the rebuild? Were you able to find new parts and gaskets for the motor? Were you able to confirm that the motor is 750 cc?

  10. #60
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    So far itís now fully stripped, James my builder is pretty sore itís mever been apart paint was still good over all the parts, the power head parts are in the chemical tank being stripped
    the mid section and all bracket parts tray etc have now all been bead blasted ready for a oem looking rear exhaust exit
    Crank has had all the bearing fits cleaned up ready to be balanced
    Fly wheel is next to have some lightening and also be balanced
    Gearbox is stripped of paint ready for a bobs ow water pickup and extended skeg
    Block head and reed block is off to bdk for cnc liner porting then port matched and some head work

    Ccm reeds all new bearings and gaskets and starter have arrived
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