Prop question???

[bradford]

Remember what I said about SOME OTHER CRAP WILL HAPPEN...?

Go to run it to get some wot numbers, jack plate position, etc, and get and overheat alarm leaving Turner Creek.

I'm pretty sure it's a faulty temp sensor or possibly the system check gauge. The pee steam was warm, but not hot, and you can touch the block while running, hot but not blistering hot. Get the same alarm on a cold engine the next day in the driveway.

Just shows how things go for me. LOL.

Thankfully under warranty.

[THEFERMANATOR]

If you want, theres a seller on Ebay selling the diagnostic software and cables. I got mine for my YAMAHA for like $75. It also allows you to check all sensor readings, and check your engine hours broken down into groups.

[garbubba]

I hear you about shims Ferm, but I've had a good bit of experience with high powered skiffs. (We put 200's on out 19 footers, with a jackup plate, they could run through wet mud.)

Often times porpoising is just a trim issue though, a poorly angled transom often, especially in skiffs so that's one place shims will work.

One other thing, is there any weight in the front of the boat? Without some weight up there the only way to stop porpoising is to shove the bow down. The air under the bow will lift it & start the cycle. When my dog wasn't up front, I used to put all the gear I could up there.

[bradford]

Thats what I still need to do, cut some hatches in the rear bulkhead of the casting deck to stow some stuff, plus my dog likes riding up under there too. I think the extra 50-60 lbs an extra foot or two forward is gonna make a lot of difference. When running fast it does feel like she'll blow over if I run her any faster or turn into the wind. Still need a different pitch prop though, and if I'm gonna buy one I want one that the boat performs the way she should under all conditions.

I know what you mean about you La and Miss guys. A friend of mine is a coonass that works on the oil rigs down there.

His dad has a jon boat with twin 115 Mercs on the transom.

[bradford]

Replaced a faulty system check tech and Patrick at Custom Marine let me borrow a 13 x 15 viper prop, the only loaner he had that would fit in the pitch close to what I'm looking for. I knew it wasn't exactly what I needed, but the skiff does seem to ride better. It turns higher rpms and doesn't porpoise as easily, also bumped the jackplate up 2 inches vs 1.5. Gonna finish up the boat before spending any real money prop wise.

[spoggy]

Correct me if I'm wrong, but isn't WOT on this motor 4500-5500?

[THEFERMANATOR]

Originally Posted by spoggy

Correct me if I'm wrong, but isn't WOT on this motor 4500-5500?

5000-5500 is factory reccomended, but theres a catch to it. They have found propping them to run on the low side all the time has lead to powerhead failures in the etecs, and making oil in the 4 strokes. They want you to prop them near the top of the RPM band now, or just a shade over when running light so as to always keep the engine above the minumum reccomended low RPM at WOT.