Please forgive my ramblings and not sure I want to spend more dollars to up grade but would sure appreciate your input. I keep looking at the 540 EFI. Have also looked at the 565 but assuming this is like the older 525 which requires head work every 200 to 250 hours, I'm saying this isn't for me. Figuring the 540 is like a pumped up 502 and should be reliable as regular use motor. If this is not correct or am I off base?