50:1
Thank you for your reply, the HP is 7.6 Mercury Thunderbolt In order to determine the year model for a Mercury outboard, in addition to the serial number, the engine horsepower is needed as well.
An 85 hp Mercury outboard, serial number 3858432, would be a 1973 year model.
The Thunderbolt ignition is a 12 volt system.
In addition to the serial number, the horsepower rating is needed to determine the year model.
Merc 850 854590512 thru 4831998 1977
Serial number 1999327
visit on the web oldmercs.comselect the model guide.you can identify the year up to 1985 from this list
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well considering the engine type petrol diesel the best outboard motor to get would be a petrol engine as this is easy fuel to come across just don't get any water in the fuel tank as this will cause the engine to cease and that's bad so get a petrol engined outboard motor and petrol hope this helps