'71 Mercury 650 65hp Outboard

[achris]

Re: '71 Mercury 650 65hp Outboard

I looked on the iBoat prop selector and as well as calling it as a 2 cylinder (Merc NEVER made a 2 cylinder 65hp), it calls for a prop with a .... 14 " diameter . (The smallest Merc outboard to use a 14" prop is 135hp). Your prop is 11" diameter.

 

[road.ripper]

Re: '71 Mercury 650 65hp Outboard

http://forums.iboats.com/showthread.php?t=367023

check the link to one of my prop questions

the prop should have the numbers stamped in the side of the hub barrel between the blades .

hope your get her running

road

 

[alex2772]

Re: '71 Mercury 650 65hp Outboard

where on the internet can i find parts for this motor such as a dist. cap and plugs?

 

[Wingedwheel]

Re: '71 Mercury 650 65hp Outboard

Try this site. Lots of info and good pricing. http://www.boats.net

 

[Carterboy336]

Re: '71 Mercury 650 65hp Outboard

How do u refill the power trim fluid in that motor

 

[GA_Boater]

Re: '71 Mercury 650 65hp Outboard

First you start your own thread instead of piggy backing on a thread that isn't related to your question and is also two years old. Read the forum rules and thank you for your understanding.

 

[Gilfredo]

Re: '71 Mercury 650 65hp Outboard



Props are usually specific to a mfr, ie., Merc, OMC, Yamaha etc. There are three specs that are important to match to your motor/boat. They are # of splines on the prop shaft (yours are probably 15), the overall diameter of the prop and lastly, the pitch, or how far the prop would travel in one revolution (theoretical).

If you look on the back face of your prop around the center hub there should be a series of numbers. The last few digits will describe your pitch, ie., 17P means 17" pitch. The numbers may also be stamped somewhere on the body of the prop.

50:1 (50 parts gas, 1 part oil) is the correct mixture. Use any name brand MARINE 2 cycle oil rated TC-W2 or W3.

Again, lower unit oil is MARINE grade SAE 90 extreme pressure (EP) gear oil. Lots of posts here describing how to do it.

Water pump is a vane type impeller that is driven by the driveshaft inside the waterpump housing. You need to replace at least the impeller with the correct one for your motor. Size of the impeller changes with different models and HP. If in poor condition, you may need to also replace the upper pump housing and other seals. No way of knowing until you get it apart.

I have the original prop

 

[racerone]

This prop confusion was likely sorted out years ago.