Four stroke
With that serial number it would be a 1986.
Model number 6303, would be a 1973 year model, 6hp Evinrude outboard.
Model number 35702H, would be a 1977 year model Evinrude outboard.
An 85 hp Evinrude, model number "85"093D, would be a 1970 year model. An Evinrude model number beginning with 35, would be a 35 hp engine.
The year model for a Johnson or Evinrude outboard is discerened from the engine model number, rather than the serial number, as a Mercury would be.
A 25 hp Evinrude outboard, model number E25TECUR, would be a 1987 year model.
An Evinrude model E4RDHSR would be a 2004, 4 hp.
The "J" prefix on this serial number would indicate a Johnson, however, Johnson / Evinrude uses the model number to designate the year model of the engine. What make is the engine?MURCURY
An Evinrude outboard, model number 35853R, would be a 1978 model, 35 hp.
The Evinrude outboard, model MQ-10R, would be a 1964 model, 9.5 hp.
A 70 hp Evinrude outboard, model number E70ELCO, would be a 1985 year model.
A 25 hp Evinrude, model number E25RCNB, would be a 1982 year model.