Hard Starting 2006 6cylinder oil injected 150hp Johnson

[Ye Olde fisherman]

I Just bought a new ( to me ) Hydra Sport 21ft boat that came with a 150 Johnson. It is very hard to start but once it is running it will continue to start.
If left for one day, it is back to hard starting. What should be the best cold cranking battery power for this motor? Any help would be appreciated.

 

[racerone]

Are you pushing the key in while cranking it over ?

 

[Ye Olde fisherman]

Yes, 2 or 3 times

 

[racerone]

Key is held in while cranking for motor to start.----------------Motor may have a " quick start " feature and you might want to have that system checked as well.

 

[Ye Olde fisherman]

Thank You for the info, I will take it to get checked out.