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Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
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Is there a difference between Yamaha out board heads 6E500

Customer Question

is there a difference between Yamaha out board heads 6E500 and 6E510 on a 115 hp
Submitted: 1 year ago.
Category: Boat
Expert:  Jason replied 1 year ago.

Hi John, my name is Jason.
I don't know where you got those numbers but they are not part numbers. If they were marked on the head then all they would be is casting numbers, and there is no real way to cross reference casting numbers to anything. That being said shaving a few thousandths of a head on a 2 stroke really isn't going to increase compression. Are you wondering why compression did not go up or did you have another question?

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