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Tan
Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 10621
Experience:  40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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I have a 4hp Yamaha 4stroke outboard 2008 a nd i would like

Customer Question

Hi, I have a 4hp Yamaha 4stroke outboard 2008 a nd i would like to convert to 6hp . Is this possible and if yes how exactly should I go about it
Submitted: 1 year ago.
Category: Boat
Expert:  Tan replied 1 year ago.

Hello. My name is Tan.

From what I can find the only difference between the 2 engines is the carburetor.

Here is the cylinder and crankcase. Scroll down to the compatible engines and you will see the 4 and the 6 are the same.

Here is the parts listings for both motors when you compare the parts you will find that the engines are identical except for the carburetor.http://www.boats.net/parts/search/Yamaha/Outboard/2006%20and%20Later/F4LMHA/CYLINDER%20CRANKCASE%201/parts.html

Here is the link to the 4.http://www.boats.net/parts/search/Yamaha/Outboard/2006%20and%20Later/F4LMHA/parts.html

Here is the link to the 6. http://www.boats.net/parts/search/Yamaha/Outboard/2006%20and%20Later/F6LMHA/parts.html

So it looks like changing the carburetor is all you need to change.

Post back with questions.

Expert:  Tan replied 1 year ago.

Here is the link to the crankcase and cylinder assy 6. http://www.boats.net/parts/detail/yamaha/Y-6BX-WE090-00-1S.html

Here is the link to the same assembly for the 4. http://www.boats.net/parts/detail/yamaha/Y-6BX-WE090-00-1S.html

If you compare all other parts they are the same except the carburetor. So the 6 carb will make your engine a 6.

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