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Mercury Racing 520 info???

Mercury Racing 520 info???

Old 02-03-2020, 08:10 PM
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Default Mercury Racing 520 info???

Looking for some general info on this motor...Google search world is pretty limited

Does the 520 need refreshed at a certain hours? Like the 525
Can the motor be used to build more HP/Upgrades I know CMI makes headers for this application?
Anything good or bad about the motor?

Thanks in advance!!
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Old 02-04-2020, 08:38 AM
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Page 46 - Maintenance.
http://download.brunswick-marine.com...8m0087090r.pdf
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Old 02-04-2020, 09:27 AM
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The 520, 540, 565 all use the same cam as was used in the 525efi.

I like the recommendation every 100hrs or yearly to compression check cylinders.
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