Mercury 850 Thunderbolt (Unknown year)

[Passorelli]

Hello all!

I started a restoration on an old mercury 850 thunderbolt. I found the serial number but I cannot for the life of me find anything online that corresponds with that serial number to the exact year the motor is. Any help determining this would be appreciated! The starter has a date stamp of 11-22-76, but that is the only indicator I have. Due to the site not allowing me to upload photos the serial number is;

Serial number: 4723195

 

[racerone]

A 1977 modell.

 

[Passorelli]

A 1977 modell.

Thank you! Do you recommend a certain service manual? There are a variety to purchase

 

[faztbullet]

Don't start buying parts till you test compression and ignition system first!