I've never had a tach go bad -- but I'll check it out with my old analog meter
and see what it ways...

On Sun, 13 May 2007 11:00:35 GMT, Short Wave Sportfishing
wrote:

On Sat, 12 May 2007 13:40:08 -0700, Josh Assing
wrote:

And ten percent of a 15 inch diameter prop would be what?

exactly - -it's not 3 mm


That is way to close for a number of reasons including cavitation.

that's what I thought -- the demo-prop-shop said "it will increase performance
by directing more water aft rather than up" seemed snake-oilish to me.


What you are looking for is a 14.5/21p or thereabouts - might need a
19p - doubt if you will need a 23.
well; wrong way -- I have 19pitch now; need to go down in pitch to 17 or 16.
(wot now = 4100, need to get it to 4400-4600)

Whoops - sorry - read that wrong. My bad.

I think you are probably close on that, but you might want to consider
having the rpm checked using a meter directly off the engine. I know
when I swapped engines on the Ranger, we couldn't get 5400 top end out
of the gage on the dash, but when we looked at the EMM, it was 5400 on
the nose. It was about the same RPM range you noted.

Threw a new RPM gage in the dash - presto.

Just something to think about.