Re: how available are parts for 70's motors?
There are lots of changes going on in every industry. 80's motors are going on 25+ years of age. Go to your local auto dealer and try to by parts for you 1982 whatever! While you may find some common items you will be hard pressed to find the model/year specific parts. On popular engines, and as long as there is demand, the aftermarket will continue to produce parts. For others, it may be time to say goodbye. Add up the cost for all the parts it takes to build and engine and you will find the total is many times the original cost of the engine. Why? Because inventory costs money. Money that can be spent on other things so it stands to reason the manufacturers are no longer stocking parts for older engines. The time is coming, unfortunately, when carbed two strokes and even some EFI engines are outlawed and hence will become useless regardless what condition they are in. You've seen Yamaha switch to a serial number program that makes model year a non-issue -- supposedly to help dealers with carry-over product. In my view you have only seen the tip of the iceberg regarding changes in the marine industry.