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500efi owners Heads up!!

Old 04-28-2004, 01:46 PM
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BAJA WILL's Avatar
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Location: Tampa, Indian Shores Beach
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Yes I replaced the gaskets also along with, spark plugs, distributor cap, and impeller. I actually used the replacement springs from merc, kind of wishing I had used Isky now??

Also I didn't think I had lost any power but I had, once I put back in the water I did notice an increase in power, not more speed but got to max rpm much faster.

If you have the carb version you need to change them at 150-200hrs I did learn that during my research, actually the carb springs are suppose to wear out much faster, I think they used a different spring.

Good Luck

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Old 04-28-2004, 02:47 PM
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Join Date: Dec 2003
Location: Ottawa, Ontario,Canada baby!
My Boats: Sunsation and Apache
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This is the most talked about engine for just this reason!

I have an EFI version, and read every post about these blue motors for the past three years.

Long and short of it, 200 hours is a good bench mark for valve replacment. Period!

Compresion test won't tell you dick!

leak down test won't tell you dick!

Visual check is the closest you can go, without buying a spring preasure tester.

If your at 200 hours, change your springs!

I'm sure I'm going to hear a few stories of 300 and even 400 hours engines running fine, I don't care! Down time to me is important. Schit we only get 4 months up here. If you can't aford to do the valves, you shouldn't own the boat!
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