specs on a yamaha 130 1989 ?

[snook1221]

i have a 18 with a 1989 yamaha 130 running a 19 pitch prop and a am only getting 5000 rpms max. i want to switch to a 17 stainless cause i feel i will get alot better numbers with this set up . i have been lookin up 130s and people say they are running them 5700 rpms? seems a lil high too me thought. my boaT runs 40.2 on a good day but its just a dog gettin out of the whole any sug?? any advicec would help thanks guys

[castalot]

Dropping to a 17p should bring you to 5400 which I would say should be just about perfect I don't have a yamaha but sounds like your a little over propped plus it will make it come out of the hole alot better if not great
Jm2c

I'm sure father frank will give a much better description

[McGillicuddy]

What is model specifically is your prop? There are thousands of configurations. Aside from too much pitch,you may have too much cup, or rake or whatever. Maybe the prop you have was designed for a bass boat. Find a Yamaha semi-cleaver with less pitch like a 13-1/2 x 17 M or K or even a 15 pitch. If a Merc black max fits a yamaha 130 I would try it... 13-1/2 x 17. I run a 13-3/4 x 15 and it is up on plane virtually instantaneously with a 115 Merc and no trim tabs. That and the semi cleaver are designed to get the stern up. A 4 blade will also get you on plane quicker but you'll probably need to go to a 15p. The pointy end of the SeaCraft will do its job

People often equate more pitch with more speed but that is not necessarily a constant especially in the mid power range or with these hulls.

Check with a local prop shop and see if they'll loan you a lightly used one oof each for a day. Test it with a fairly heavy load to see where you are. Good luck.

[apneadreams]

Check this site for prop education..
http://www.boatfix.com/how/props.html

[snook1221]

thank you im probably goin too get a 17 to try out this weekend
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