hard to explain but here goes.
This is start up in the water not on land.
-Squeeze primer bulb
-Use the idle lever about 1/2 - 3/4, you won't over rev since the jet impeller is always moving water.
-Start cranking the engine, when the engine is cranking over, push and release, every second, push and release until it starts. Don't keep it pushed in. Use it like a pump.
Now it's running.
-leave the idle lever up, as the engine begins to idle down on its own (like it's about to stall), push the key again (the engine will rev up) Every time it sounds like the high idle is falling, push the key again (push and release don't hold it in) Do this until the rpm is stable and dosnt fall.
- once the rpm is stable and you can lower the idle lever to a warm up rpm.
In the summer it may only need a few key pumps (key pushes), but in the winter or cold mornings you will need a lot more key pumps.
Hot starts almost never need key pumps, only high idle lever. If it doesn't start give it a key pump while cranking.But don't over do it on hot starts.
Never hold the key in, use it like a pump. And don't key pump without the engine cranking.