I have a 640LX, same boat like 6" different.
No porpoises issues. Just leaving work, will see what hole bolts are in.
You could just have a crappy prop that can't keep the bow up, not enough lift.
What motor do you have?
Removed divider in my 640LX. Will not come out in one piece unless you remove top cap of boat. I cut mine in half with a 3" cutoff disc. Like the livewell better with no divider
Have an 04' 640LX, my recirc pump has quit. Looks like removal of fuel tank is only way to replace pump cartridge. Top of pump is right against bottom of tank.
Anyone changed one on this boat?
My 05 Nitro 640LX runs and handles best around 4 1/2" prop to pad. Very similar boat to yours.
I have a 75hp opti with 90hp computer and 90hp throttle body restrictor.
50-51 GPS@ 5760rpm by smartcraft monitor with just me 205lbs, gear and 1/2 tank of gas.
2000ft altitude and Lazer II 22p with...