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    F-3 or F-4 prop on a Duo prop?

    I have a 22' Sea Sport with a 5.0 Gi PWTR engine and a volvo penta outdrive DP-SM with a ratio of 1.95 (Serial number 4112065003) Can I run this outdrive safely with the F-4 stainless steel prop (will this prop put more stress on the engine and contribute to valve problems?)? or Should I use...
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    1999 Volvo Penta won't go above 2000 rpm under load

    I have a 1999 Volvo Penta Duoprop 5.0 Gi. (The engine has performed great the past 5 years only 750 hours on the engine.) The engine won't go over 2000 rpm under load. ( I can free rev the engine in neutral to 3500 rpm with no problems.) When under load and accelerating the engine backfires...
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