Bad starting hot

[Ian47]

I have D24T fitted in my boat, I have just replaced the timing belts and timed the engine to .85. She starts perfect and runs fine, however when I stop her and immediatly try to restart her, she won't start. If I leave her for a bit then try her she eventually starts. I read somewhere a long time ago that this can happen if she is too far retarded. I am not confident that the cold start was fully disconnected as it is a bit rusty, so the dial gauge reading may not be accurate, can anyone adsvise me?