ken2

Fuel Supply Module I believe. From what I understand (and I'm not verado mechanic by any stretch), there is a little float/valve that controls the fuel flow. Ethanol warps this float, and it can't slide up and down like it should. Then it gets stuck in the position that tells the engine it has fuel, when in fact, the fuel is shut off. The result being, you have 100 gallons of gas in the tank, but your engine is starving for fuel.

its most likely your FSM. Needs to be replaced on both motors. You can thank ethanol for your problem. lots of info on veradoclub.com There are 3 generations of FSM's so far. make sure you get the latest one. Although, I still don't think its ethanol proof. There is a fix you can do by mounting a fuel bulb on your fuel line. So when you Do have the problem. (and its not "IF" its "WHEN") then you can pump the fuel bulb and get home. Here is a thread that discusses the emergency fix. http://www.veradoclub.com/smf/index.php?topic=1044.0

There is nothing wrong with your motor. RPM and prop slip is directly related. your engine running poorly can't make a prop slip more. If all the load was in the back, and it wasn't solidly up on plane at 26, the slip will be higher. Don't know what kind of boat you have though. You could take that prop to a good shop and see if they can referbish it and make it run well again. As for the prop slip calculator, all props are cupped a little now days, I'd just stick with the pitch thats stamped on the prop.

back when THT first started "2001" was when all the outboard manufacurers were first switching over to Direct Injection. And they all had issues at first. Everything was blowing up, and all the inboard and sterndrive guys were laughing at the outboard guys. Since then, the manufacturers have worked out all the bugs, 2 strokes are just as good as 4 strokes, and both are doing exceptionally well on fuel economy vs the old outboards. I still hear people talking about those "gas guzzling smoky, stinky 2 strokes".... that was 10 years ago. You would think that stigma would be gone by now. My boat has a sterndrive on it, my next boat will have an outboard

I thought you were going to try some Rev 4's. I saw a picture of one in your last thread.

Try to find fuel somewhere in your area that doesn't have ethanol in it.

Get something long and metal. I use a 1/2 inch drive pull handle that I take the props off with. Anyways, as long as its 1 ft or longer your good. Maybe a large crecent wrench, combination wrench, piece of pipe. The longer the better. Wedge the end of it underneath the thrustwasher, and the bar will be resting on the gearcase housing. Now just bump your end down with your hand. Don't just "pull" on it, you have to bump it a bit to "pop" it off there. If it doesn't pop right off, just do it on the other side, and it will come off eventually. Most likely it will pop off on the first bump of your hand.

I was 12. (1989) The motor outweighted me. Tilting it up by hand was about everything I could muster. 16 ft Glasstream bass boat. 1974 Evinrude 50 hp Killed the engine once, then rebuilt it and it lasted for years probably still running somewhere. It loved abuse. She was named "Miss Treated"

curious how the yamaha props do when you jack them up

The Saltwater series 2 is 15 inches diameter I believe. The Enertia gets very small as pitch goes up. the highest pitch is 22, and the diameter is about 13 7/8 at that point. You would probably bang the rev limiter pretty easily, and midrange probably wouldn't be very good either. Do you have a jackplate or anything on the boat? The Mirage Plus, is fairly similiar to the SWS, and the Tempest Plus does well too. I'm a big fan of merc props, but, I don't think they will be any harder to ding up then Yamaha's.

I believe continuously hitting the rev limiter will put you in gardian mode. I've been on a few boats and even in smooth water, if they are on the limiter too long, we have to come to a stop, shut the motors off, turn them back on, and were on our way again.

Sure looks like homesite. Who knows. Here is his quote on the other site.

Homesite posted on tht. he said it was a quad fountain, but not his boat. His boat went into gardian mode. I guess they over revved it. I don't know what the power was on the Quad Fountain that won. Can't wait for the video. 2-4ft seas and we can see all the boats run in the same conditions. There was also a mention that the Invincible that got second lost a motor?? did you hear anything about that one?

is anyone there to give us an update when the race is over?

Friday is race day. Photo op at 10:00 AM from what it says. http://groveslam.com/schedule.html

Same gear ratio, same rpm range. Assuming you were set up correctly before, They would have to find some serious HP in those motors to warrent going up in pitch. Run what you have.

If you want stock Yamaha props, Andy and Shipyard Island Marine is a good one. Many other brands will fit. I deal with Quicksilver, Mercury, and Powertech mainly. The prices mentioned above are about right. 120 ish for Aluminum, or 280+ for SS.

Zuke props are pitched higher then they are stamped, which makes it hard to figure out prop slip numbers or what a "realistic" top speed might be. Your slip numbers. 6000 rpm, 2.5 gear ratio, 23 pitch, 52mph comes out to .005 slip. which is not really possible if they were truely 23 pitch. The other guy with 21.5 pitch props. would be at a negative slip number. But who knows, maybe his boat is just set up really well. The last 27 Contender (older) I ran had a tough time cracking 50mph with a decent load and F225's. But loaded light is a different story. 4 blades will help keep your bow down and fix the ventilation. But I'd still cup those things and see what happens.

Thats ok, lets hope they work well !

I agree with triumph, Those numbers are very good. Your rpm is Perfect. Staying with the same style prop, and just going down in pitch isn't going to change much. It will accelerate better, but its going to cruise slower and not as efficient, and probably not be as fast on top end either. Its still going to ventilate when you trim them up. I would get a good prop shop to put a little cup into your existing ones. It will lower your rpm by about 150-200 which is fine, you'd still be ok at 5800 or 5900 rpm. The cup should help with the slip or ventilation your having. Should bite better throughout the rpm range. You'll still get your good economy, heck you may even improve on it. It doesn't cost much either. probably about 60-70 bucks for the set. There have been quite a few guys that had ventilation issues with those props, and lots of them liked 4 blades for the better bite, but as good as your numbers are, I'd spend $60-70 try a little cup before you try a different set.

FishinNutz (Is this Ken as in "PROP GODS" ken?) Yes FishinNutz, thats me. going 29 mph at 4200 RPM is 28% slip. That is pretty high, so your Tach is definately not reading low. I'd go with 15 Enertia's and see what happens.

The reason I'm asking about speed, is your tach may be off. Your 1500 rpm low which is HUGE. lugging the motors that much, I'm amazed you got up on plane. If it didn't struggle much to get up, your tach may be off, and your not as far off as you think.

I'd go with a set of 15's. Check the motor height. If they are too low, that can rob you of rpm, speed and economy. Mirage Plus 15's are 15 3/4 diameter. Thats probably an overkill, I'd try Enertia's. They are a little smaller diameter, and easier to spin up rpm. No computer program that I know of kicks out the correct prop. They will get you close, or a good starting point, but thats about it. Mercury's selector just list every prop that will fit your motor and get close on rpm. How fast are you going at 4200 rpm?

Merc goes up to 250 on the opti. Seems like a bit of an over kill though. http://northamerica.mercurymarine.com/engi...ards/bigtiller/

Correction, it was a 34 Venture, not an Intrepid. I just got off the phone with the guy.