I'm looking at a boat that has a 1983 Johnson 115 V4. I know some basics about mechanics but not much about this engine. Is this a good engine/year model? Are there any problems that seem to be common to this engine? It has been used in salt water. Are there any certain items that need to be looked at on a pre-buy inspection? What would be some educated questions to ask the mechanic about it? Thanks,bell47.