I have the original prop from my Johnson off to take a look at, its got quite a few nicks some of the them quite deep. I have found that if I search for the part number stamped on the prop on ebay I can get a new one for about £45. This is about 1/2 the price of getting it refurbed.
However when I look at any description of this prop it says : 13 1/4" x 17"
However on my prop it is stamped as 14" x 17" on the actual prop casing, when I look up the part no. on the BRP parts catalogue it also states there that the prop is 13 1/4" by 17".
So I took my tape measure out and I reckon that on measuring the prop is 14" diameter so the part number seems to be wrong????
In answer to my own question apparently there are a number of Johnson Props that come under this part number, the older styles actually were slightly smaller in diameter whilst the more recent version is the larger 14" version.
3/4 inch change in diameter should yield somewhere in the area of 300 rpm difference at any particular throttle setting. Unless you're pinning the rpm to the manufacturer's max WOT rating now, I wouldn't think it would be all that big a deal. I get that much change in rpm from throwing several people overboard while underway.
