22' 255XD Top Speed/Max RPM Issues

[rgriffintx]

We are on year 2 with this boat and although some minor issues, no complaints. Trying to figure out why it seems as though we've lost a significant amount of top speed though. When we first picked it up, mid to high 50mph, max was probably 57mph. Lately, it just seems impossible to get over 42mph. Tried keeping the hull clean, minor difference. Checked cleanout ports, all dry. Visually inspect impellers, no damage. Max RPM also seems to be down a few hundred RPM, so thinking it may be pulling power due to the heat? It's been 105-110 degrees pretty consistently here in TX, but this seems like a big drop.

 

[HangOutdoors]

Spark Plugs? Make sure your air filter is clean and not have oil in it.

heat and humidity will knock off a couple few hunderd RPM's.

 

[rgriffintx]

Spark Plugs? Make sure your air filter is clean and not have oil in it.

heat and humidity will knock off a couple few hunderd RPM's.

Plugs and filter should have just been done beginning of the season when I had the dealer go through it, but I'll double check just to be sure.

 

[HangOutdoors]

Check em.with a gap Guage as well

 

[jacoviii]

Did you get this worked out?