Thread: Gear ratio?

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  1. 02-06-2020, 02:55 PM #1
    rocketman6965
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    Gear ratio?

    Checking for a friend. 135 Mariner Opti Serial OG720412. Thanks in advance. Looks like a regular Servicemaster LU.

    Joe Perez
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  2. silverbullet02
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    #2 02-06-2020, 03:17 PM
    Put it in gear and rotate the flywheel until the prop makes one turn. Most likely 2:1, could be 1.87.
    1995 Allison XB-2003 225 Super Mag. It's slow and I'm ok with that.
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  3. John Jackson
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    #3 02-06-2020, 03:45 PM
    Is it the small or large lower unit. Small came in 1.78 and 2.0. Large are almost always 1.87.
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  4. rocketman6965
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    #4 02-06-2020, 03:53 PM
    Large. Trophy prop is smaller diameter.

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  5. JOE54
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    #5 02-06-2020, 03:57 PM
    all 135 should have came with 2:1 per serv manuals/ that number comes back as 1998 3cyl 40hp
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  6. rocketman6965
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    #6 02-06-2020, 04:50 PM
    Sorry Joe. I’ll get correct number tomorrow. Senility is setting in

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  7. JOE54
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    #7 02-06-2020, 05:05 PM
    aint no thang, 135 had 2:1 unless somebody changed it
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  8. EuropeanAM
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    #8 02-07-2020, 08:19 AM
    Quote Originally Posted by rocketman6965 View Post
    Sorry Joe. I’ll get correct number tomorrow. Senility is setting in
    Joe's right. But let's update that with the accurate number to triple-check.


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  9. rocketman6965
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    #9 02-07-2020, 08:50 AM
    My bad. OG724012

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  10. EuropeanAM
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    #10 02-07-2020, 10:56 AM
    Should be a 2.0:1 as Joe stated.


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  11. rocketman6965
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    #11 02-07-2020, 11:37 AM


    Quote Originally Posted by EuropeanAM View Post
    Should be a 2.0:1 as Joe stated.

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  12. JOE54
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    #12 02-07-2020, 04:13 PM
    you gonna have to use them glasses I sent ya heeeeeheeeee
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