1985 85hp prop question

[FDB]

Have a 16ft bayliner with the 85hp force, I used to have a 13x19 pitch (still have it) but was told that that was way too big, so I now have a 13x17 on there now, the motor sounds like she is getting more rpms but now someone else told me that I may wanna go with a 13x15. Does anyone know for sure. The prop game is hard and costly. What was the original prop that came with these motors?<br /><br />Thanks

 

[roscoe]

Re: 1985 85hp prop question

The right way to go about it is to monitor your Wide open throttle ( wot ) rpm via a tach.<br />A simple and effective way is to get a tinytach.com for $40.<br />Without a tach, you are just guessing on if you need a different prop or not, and guessing which one to buy.<br /><br />There generally are no "stock" props for motors over 40hp.<br />The same motor on a 16-17-18' boat would require a different prop. The load and the type of use also effects what prop you go with.

 

[FDB]

Re: 1985 85hp prop question

OK, second question as far as a tach goes. I have been contemplating on buying a tach, seeing that it seems fairly simple to hook up to my outboard. Do the standard teleflex models that they sell at Boatersworld (up to 7000rpm)be sufficient for my outboard.<br />Again Thanks

 

[roscoe]

Re: 1985 85hp prop question

Your Force motor requires a tach for a 20 pole charging system. These are a little hard to find at local shops. If you do a google search, you can find it for $60.<br />Teleflex part number 53743P<br /><br /> click for tach <br /><br />The tinytach is a small digital display unit, simply wrap the inductive pickup wire around a sparkplug wire.

 

[Realgun]

Re: 1985 85hp prop question

Can get it for 39.95 plus shipping if you look in the right place. But its not that 8000 rpm teleflex unit.<br /><br />Might get that tiny tach they will work.