ellwood

it was on the speedo. i think i had the drive trim set at around 4 and my tabs set at around 2.5. still playing with it. never had a stepped bottom boat.

ellwood

hi gang. hey my 2 dashboard warning lights blink 2 yimes after a whlie every like 60 seconds. anybody know if thats a code? all temps are good and pressures are good. cant find it in the online manual.

c0ncEpT

No way to tell without getting it scanned.

4500RPM should be like 55-60mph with some stick left. Wide open should run 5000-5100 and around 67mph

ellwood

hello gang. its the first time fountain owener again with a few questions...... my warning lights keep flashing at higher rpms and even start beeping. all guages are normal but one. the needle on the oil TEMP guage is not wprking and the red light in the middle of the guage goes on. would that make warning lights go on? and should i just disconnect it for now, and if so, where is it on the motor? also speed vs rpms.... it runs about 50 mph with half tank and 2 people.at 4500 rpm. im trimmed at 5 on the drive and 2 and a half on the tabs. i can get about 60 out of it with the same trim at WOT. any thoughts would be appriciated. thanks again. spark issue maybe?

ellwood

hi guys. hey, can anybody tell me the correct prop to be spinning on the 29 fountain fever? its got the 496 HO and im running 5100 RPMS and getting about 55 out of it. it all trimed up and everything.....

rak rua

You should be getting a good 10mph more.
Boat doesn't need much trim, stepped hulls run best with minimal trim, use the power to push the boat forward rather than upward, the step will generate the lift.

Revs are right at 5100. Is your speedo accurate? Is it a gps speedo or a pitot tube? Something's not quite right. I'm assuming your prop is in decent shape, it'd have to be pretty ugly to lose 10mph.

I'm not 100% sure but I think the standard prop is a Bravo 26" (4blade). Also the drive ratio is 1.5. Hopefully someone else will jump in here and confirm or correct me.

RR

rak rua

Mercury prop slip calculator......
https://www.mercuryracing.com/prop-slip-calculator/


34% slip is too much, half that would be excellent.

ellwood

ya. welp, as per the owners manual, at WOT im trimming the drive to number 5 and the tabs to 2 and a half. im getting the RPMS out of it but no speed. had a guy drive it yesterday who oewns on and with the drive not trimmed up at all and tabs up he was only getting like 47 out of it. maybe it is the wrong prop they are pulling it today......thanks for the stuff!!

ttuton

As far as I know most fountains run hydromotive props. My friends Single 500hp 29 would run 74mph with a left hand hydromotive. Unfortunately I don’t recall the pitch.

c0ncEpT

Look at the tag on the side of the drive. It will have a ratio listed. A lot of late model 27 & 29 Fountains came with a 1.65 ratio instead of the standard 1.50 ratio. If yours is a 1.65 than you will need a 28p or 30p prop. I have a feeling this might be your problem.