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Message Subject: props for 4-strokes

Posted 7/24/2007 7:47 PM (#266929)
Subject: props for 4-strokes

I have resntly purchesed a 2007 G3 V172 with a 115 Yamaha 4-stroke. From the factory it came with a 13 1/2 x 19 prop. I could only get 4400 rpm out of it (5500-6000 red line) with a top speed of 35 mph. I went to a prop repair person and he gave me a 13 1/2 x 17 pro tech prop. It ran 45 mph but ran out at 6000 rpm. I went back to him and switched to a 13 1/2 x 19 pro tech and ran 38 mph at 5400 rpm. I would like to run 42-43 mph at about 5600 rpm. Any thoughts?????

please ANY thoughts. Thanks in advance.

ESfishOX

Posted 7/24/2007 11:06 PM (#266961 - in reply to #266929)
Subject: Re: props for 4-strokes

Posts: 412

Location: Waukesha, WI

try posting here too.

http://walleye.outdoorsfirst.com/board/forums/forum-view.asp?fid=11

Shep

Posted 7/26/2007 11:38 AM (#267252 - in reply to #266961)
Subject: Re: props for 4-strokes

Posts: 5874

Are these aluminum props? If so, fid a dealer that has a demo prop program, and try several different stainless steel porps. I'd strat out with a 17 pitch pro Series from Yamaha. You can run Merc props with a hub adaptor kit. Better selection in Merc props, and you should be able to find the best prop for your combination.

Posted 7/27/2007 10:12 AM (#267430 - in reply to #267252)
Subject: Re: props for 4-strokes

These are ss props. The prop I found was a merc prop it runs 5800 rpm at 42 mph. Now I have a little trouble with cavitation. The motor is lowered all the way and I trim the motor all the way down when cornering and still get cavitation. Does anyone have any answers for this issue??? I go to the dealer and get the run around !!! Would it help to put the dolphin tail on the plainer fin???

Thanks again

Shep

Posted 7/27/2007 10:56 AM (#267433 - in reply to #267430)
Subject: Re: props for 4-strokes

Posts: 5874

What is the model prop you have? Is it a vented prop? Does that ventilation cause the cavitation when you slow down while turning?

There is the optimum prop out there for your boat/motor combination. If you dealer can't/won't help you, find a dealer that will.

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