First, when cranking the motor is sounds like something is grinding
The motor does start and runs perfectly fine once it's one, it just makes this sound while cranking:
Any ideas of what could cause either of these sounds? Second video is in reply
I've got a Mercruiser V8 5.7 with the Thunderbolt V ignition system
The boat starts up instantly when the throttle is open but as soon as your bring the throttle back to neutral then the engine dies.
Here is a video of what is happening: http://youtu.be/IrlKw2uHJ_U
2 weeks ago I took the boat...