How Fast Should 50hp Evinrude Lark Move My Pontoon Boat

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mirage5058

Seaman
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Jun 2, 2008
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Anyone know how fast a 50hp evinrude lark should move my 24ft pontoon?Best i can get is 10mph according to gps
 
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EN2

Chief Petty Officer
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Nov 19, 2007
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404
Re: How Fast Should 50hp Evinrude Lark Move My Pontoon Boat

What diameter, pitch prop do you have on it now?
 
lindy46

lindy46

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Nov 27, 2008
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Re: How Fast Should 50hp Evinrude Lark Move My Pontoon Boat

Is that motor an old "Fat 50"? They were pretty doggy motors, but it should push it faster than 10mph. I have a 20' pontoon with a 1957 lark 35hp and it pushes it 19mph.
 
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mirage5058

Seaman
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Jun 2, 2008
Messages
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Re: How Fast Should 50hp Evinrude Lark Move My Pontoon Boat

I believe its 13 1/4 or 13 1/2 x 17 cant read the markings to well worn quite a bit
 
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EN2

Chief Petty Officer
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Nov 19, 2007
Messages
404
Re: How Fast Should 50hp Evinrude Lark Move My Pontoon Boat

17 pitch is way to high you should try a 13 pitch, and check your wot rpm. What year and model is your motor?
 
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mirage5058

Seaman
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Jun 2, 2008
Messages
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Re: How Fast Should 50hp Evinrude Lark Move My Pontoon Boat

The motor is a 71 50hp electric shift, i will tell you the motor runs perfect and shifts perfect,i took a 25hp evinrude off the boat and put the 50hp on for a little more speed but believe it or not the 25hp went about 14mph,i was dissapointed when i found out how fast the 50hp was going
 
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F_R

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Re: How Fast Should 50hp Evinrude Lark Move My Pontoon Boat

mirage5058 said:
Sorry model #50173s
Click to expand...

You say it runs perfect, but is it really? They will run pretty darn sweet on one cylinder, but have no power.
 
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mirage5058

Seaman
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Jun 2, 2008
Messages
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Re: How Fast Should 50hp Evinrude Lark Move My Pontoon Boat

You know i never did do a compression check because it did run so good Maybe i should,both plugs are firing as they should.When i first put the motor on, it throttled up quickly and had a ton of power but now that you mention it when i took it out today it seemed to run just as good but a lot less power,i did notice when i first went to speed up the lever wouldnt move so i shut it off and restarted it. The throttle moved as it should,but with hardly and top end power
 
McGR

McGR

Senior Chief Petty Officer
Joined
Jun 19, 2004
Messages
654
Re: How Fast Should 50hp Evinrude Lark Move My Pontoon Boat

Those 2 clyinder looper Larks weren't bad perfromers - seems like it should definately do better than 10mph.
 
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EN2

Chief Petty Officer
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Nov 19, 2007
Messages
404
Re: How Fast Should 50hp Evinrude Lark Move My Pontoon Boat

Are you actually getting full throttle at the carbs? Check to see if the butterflies are horizontal.
 
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