I have a 1987 Force 50 outboard motor. It starts perfectly when I go to start it after it's been sitting for a few hours. However after I take it out for a spin and shut off the engine it's hard to get it started (while still warm) without throwing the motor into gear. Could this be an issue with my air/fuel mixture and if so, how do I adjust this on my carburetor? If not, what else can it be and what can I do to fix?