I bought a 2000 Regal 2500 with a low hour Volvo 5.7GSI Penta duel prop. The boat has a fresh tune up by the mechanic who sold it to me. He told me not to open it up until I ran a fresh tank of gas through it since it hasn't been used in a while and likely had old fuel. I have now done that. It ran and runs very smooth until I open it up, when it bogs down before starting to increase its RPMS and sound more like a normal boat running over 30mph. It never does reach what I've read to be the proper speed or RPM though. Any help would be appreciated.
Greg
Greg