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Old 05 September 2011, 16:06   #1
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Identifying Mercury Gearbox ratio?

Hi guys, I am trying to correctly determine my prop slip on my Merc 150 setup. To date I have been assuming I have a 2:1 ratio but I see from the Merc Manual that there are also 2.3 and 1.85:1 options. Merc tell you the number of teeth on each pinion but to be fair that's not a whole lot of use if you aren't stripping the box now is it?

I suppose I could rotate the flywheel and see how many degrees the prop does but is that the only way of determining?

Thanx in advance of replies.
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Old 05 September 2011, 16:19   #2
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Is there a sticker on the gearbox with 13 or 12 or 14? Sometimes they put these on. The number is how many teeth the pinion gear has.
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Old 05 September 2011, 16:53   #3
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Unless you know the history of the motor, the sticker don't mean shit! stick a bit of tape, or a tie wrap on the propshaft, and rotate the flywheel with the plugs out and in gear!
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