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Hello, I'm Tan. Welcome to JustAnswer. I'm reviewing your question and will reply momentarily.
Do you have a volt meter to do some voltage tests?
Could I get the engine serial number please?
Because they have been making the 90 hp since the early seventies and they are all different. I have to know what model you have and they are all cataloged by serial number.
If you don't have serial number I can do some trouble shooting. Locate the start solenoid on the engine and test for voltage on the yellow/red terminal of the solenoid with key in crank position. Do you have voltage?