15 215HO SB engine won't start

[Capt. Disaster]

ran into a guy here on the lake we're cottaging on with a 15 215HO and his SB motor won't start. It cranks slowly like a weak battery but won't go. Boat only has one battery like mine and the port side fires up np. Boat has 50 hours on it. No warning lights on. Any thoughts on where one would start?
Thx...

 

[Pirana]

Hydrolock, weak starter, loose grounding wire

 

[kxracer1]

air lock in fuel lines happened to ours when we picked it up after it had been run out of fuel for transport. tech at dealer swiched the fuel lines on sending units to break air lock then switch them back seems to have fixed the problem

 

[Capt. Disaster]

Follow up on this issue - buddy with this 15 got it into his dealer and found out that the bearings seized up, the flywheel got destroyed and there's filings everywhere. Getting the entire engine and supercharger (SB side) under warranty.