Have obtained an elder Johnson 6hp motor.  Been in storage for ten + years.  Cleaned up well, runs with help from starting fluid but will not continue to run.  Question; clogged Carb?  Also trying to establish the vintage of this thing.  Model GR-69M, Sn J3049426.  Any one have a similar unit?  Want to get a manual but need year first.  Thank you.  See ya!