250 ProXS won't go over 5200 RPM, where to start looking?

[EuropeanAM]

Jerzia: That's tough. Two good starting points:

1. Remove cowling and make a careful VISUAL inspection for plug wires off, bad, loose components, leaking fuel, etc.

2. Audit any BOW weight changes for increases and add WEIGHTS in the rear compartment to bring your boat back to matching the weight of your lead-acid batteries. Lithium really hasn't been approved for these, and one commonly missed point is that the substantial loss of weight can made for a considerable amount of difficulty in the performance area.

[jerzia]

Jerzia: That's tough. Two good starting points:

1. Remove cowling and make a careful VISUAL inspection for plug wires off, bad, loose components, leaking fuel, etc.

2. Audit any BOW weight changes for increases and add WEIGHTS in the rear compartment to bring your boat back to matching the weight of your lead-acid batteries. Lithium really hasn't been approved for these, and one commonly missed point is that the substantial loss of weight can made for a considerable amount of difficulty in the performance area.

Visually everything "looks" fine, nothing out of the ordinary, no leaks, loose wires etc. After adding lithiums, I did move all the weight I could to the rear. I'm about 50lbs lighter than I was before. I could add a wake board ballast bag in the rear to get the 50 back, but even then, it seems low to be 7-800rpms off.