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Old 29 July 2011, 12:08   #1
Country: UK - England
Town: Essex
Boat name: Club Boat
Length: no boat
Engine: Yam 40hp
Join Date: Dec 2006
Posts: 288
Honda 40HP prop

I am hanging my head in shame, 4 years and a decent looking prop, 1 decision = a nackered prop.

How do I measure which prop I want. What measurements do I take to work out which one we have at the moment, ie change like for like.


RAD is offline   Reply With Quote
Old 29 July 2011, 15:58   #2
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,620
Take the prop off, and you should [hopefully] find markings to indicate diameter (Honda 40 has a 3.25" gearcase, so something less than 12" diameter, I'd guess), and pitch whole number, likely 8 to 15". It will probably be marked similar to "10.75 x 11" which means a 10-3/4" diameter with a 11" pitch.

Your prop will be determined by: the diameter and spline count of the prop shaft (Honda is 13 spline, I think), the clearance between the prop shaft centerline and the bottom of the anti-ventilation plate, and the pitch (selected by the max rpm your motor will turn it at WOT.)

Hope this helps;

jyasaki is offline   Reply With Quote

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