figuring out existing prop size

[Kracker Jack]

How do I know what's size prop I have my motor? There are no markings to tell me.

[Destroyer]

How do I know what's size prop I have my motor? There are no markings to tell me.

Did you take the prop off the shaft and look at the huib? Usually there are markings on it (Michigan Wheel is great for putting their numbers there). Ditto with Mercury, although they also put their numbers on the outside hub between the blades. If all else fails, I'd take it to a dealer and see if they can match it.

[Kracker Jack]

yea i checked the hub with no joy.