1970 evinrude 25 shear pin broke

[Austin5189]

The shear pin in my evinrude broke kinda chewed up the groove in the prop should I replace the prop? And I'm running it on a 16 foot Sundance skiff the boats pretty heavy what prop pitch should I go with to help plain it off it does not like to plain with the current prop thanks!!!!

 

[steelespike]

Without your present performance numbers and prop size we can't be much help.
The motor needs to be propped so it can reach its rated wot(wide open throttle)range.
The 1970 is rated at 5000 to 6000 rpm. and is 22 cu. in. displacement.
Once established you can operate at what ever rpm you prefer.
Your present prop size should be on the hub or near the base of the blades.
Would be best to have your present rpm and gps speed. An induction tach would work for your rpm.
With your prop size and gps speed we may be able to evaluate your setup and help select a prop.
A new prop will likely have the newer technology.

 

[Austin5189]

It's definitely not getting full rpm the when it's pinned it does not sound like it revving out however in reverse it revs higher the forward

 

[Austin5189]

The number I found on the prop is 012011 can you guys help me find a prop that would help me plain off and let me know where to buy it I plan on ordering a new one Monday and I also want to buy 3 extra shear pins

 

[steelespike]

Did you look carefully for actual size numbers. on the hub or near the base of the blades.
The info that you haven't given us is really important for the health of the motor and for the best performance.
You might as well put some props in a barrel in the dark and pull one out.
If I had to guess pick a 9" pitch prop and consider it a starting point.
You should get a tach for rpm and get us the gps speed.
With no information if the motor is lugging you are likely to have premature repair problems
if over revving the internal parts may come outside.I do think it isn't likely to be over revving.
Get us your lightly loaded wot rpm and gps speed with the new prop.

 

[JimS123]

You need to tack out the motor at full throttle. Without that data nobody could even guess at what you need.