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Merc hp500 efi

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Old 01-21-2008, 11:00 PM
  #1
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Default Merc hp500 efi

Looking at a 2001 boat that has a pair of hp500efi with 190 hours.Question is how many hours before you have to do a rebuild on them?
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Old 01-21-2008, 11:45 PM
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top end should be looked at around 250-275, the valve springs are what you need to check. But a complete rebuild is 500-700 hours. But all this depends on you maintance and how you run the boat.
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Old 01-22-2008, 01:30 PM
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mine have 550 hrs. Recent compression check by Performance Marine Service of Lake George, NY didn't show any problems. John recommended "refreshing" the top end at 700 - 750 hrs. He estimated about $7000.00 for a pair of Merc Blue Motors, if you did it before you started having problems.
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