Careful what you buy...
You might find it hard to locate, as I did. I went to the Yanmar dealer, gave him the spec on thn year of the engine and showed him an existing key, and he sold me (for $5) a key that did not work. The shank was too long.Later he told me the engine was so old he couldn't get the key and thought the newer one would work.About that same time the old switch fell apart, I rewired it with a modern keyed setup and eliminated the need for a Yanmar key.Good luck.SandersSV Good NewsSacramento