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put the mercury high 5 21 pitch on boat left vent plugs in place. With just me in there at 200lbs and a full tank of 93 octane gas hit around 53 to 54 mph gps speed at around 4800 to 4900 rpms. hole shot was a little better than the stilletto 20 pitch 4 blade prop but picked up 1 mph speed with...

hey cubbee I found 13.25x21 pitch merc high 5 prop at jacos marine in Tennessee phone 931-762-6710 for $ 449 I will let you know how it works. I found the best way to get on the quickest plane with this boat is to cut the wheel to left or right and just nail it. It keeps the lower unit out...

cubee that is a stiletto prop still on the boat can keep that sucker on a plane at just about any speed. can also keep the nose up when I need to when going slower without hunting and seeking. If I can find a high 5 21 pitch to try before buying I will. 4 is better than 3. 5 must be better than 4

the other prop is a stilleto bay pro2 4.75x14x20 pitch 4 blade stainless. hit 53MPH at 4700 rpm in windy rough water GPS speed. Not as fast as stock prop but the preformance of this prop in rough water/hole shot is hands down better. Dealer said these new motors are really sensitive to oil...

I will check them both out before I put it to bed, thanks.

sounds like they did the same thing my dealer did as I posted on 8-1-2012. you have the pollution ect motor they probably hooked the wires to the four on the tach. They should be hooked up to the 8 on the tach not the 6. Mine did the same thing. good luck.

Got boat back again. dealer found bad injector and to much oil and tweaked timing. Put it in the water today and with stock prop 21 pitch 3 blade vengeance was at around 4800 rpms and 53 to 54 mph GPS. They even put gas in my tank maybe the follow this thread?? In the spring I am going to check...

Got boat back after new fuel pump and regulator. With the stock 21 pitch vengeance prop I got 4500/4600 rpms was at around 52mph trimmed out into the wind with a full tank 93 octane just me in the boat and about 53 with the wind, all gps speeds. Speedo said 57. After runnng it balls to the walls...

nothing but gps speedo on boat is 4to5 showing faster. talk to ya next week.

Dealer found bad fuel pump and regulator after running it on water with laptop. He is sure that it is the problem. Lower unit gearing is correct. Parts won't be in until Tuesday. I was wondering what that whining noise was when running it. I just thought it was the serpintine belt, it did it...

much thanks there jeffw dealer is gonna check mine out. I know speedo is reading about 4-5 mph higher than gps says. Let me know what you get. mine is at the dealer. If you go to boat test.com this boat/engine and same prop should be at around 4600 rpms. Called several different dealers in U.S...

Hey jeffw are you running the vengeance 21 pitch blade on your boat that came with it. If so what rpms are you getting at wide open throttle. You have the same boat as me.

if gearing is correct I wonder if the high5 19 would raise my rpms a bit or stay where they are, and what it would do to top end speed. For the time being I'm just enjoying the ride. I will let you know what they find. From what they told me it's happened before.

cubee tanks for the info, at this point it is actually entertaining and would do it all over again cause I love this boat. The only time I ever saw over 4300 rpms is when I put an aluminum 14x19 pitch 3 blade on it and hit 4750 rpms. I would think that the motor with that prop would have been...

all serial numbers stampings and even mercury marine verified that it is indeed a 1.62. even the barcode stickers on alpha drive said so. Merc marine said that there are different gearsets that are universal for this drive. he rattled a couple off 1.50, 1.62, 1.47, 1.81, 2.0, 2.4, the original...

what gear ratio came with your boat, and what prop are you using. What rpms and speed do you get wide open. Sounds like you have the same boat as me.

Blaster I am running the boat in wisconsin, not a high altitude. Dealer called and said the factory could have mislabled my out drive from the start. I may not even have the 1.62 gears like I am suppose to. My question now was there damage done to engine from lugging the motor for 23 hours.

Thanks cubee I think they over propped me from the start with the 13.75x21 pitch 3 blade stainless vengence. wot 4300 at 52 mph. Sorry I did not see your post till now. I will get back with you when I try the 14.25x 19 pitch 4 blade that I borrowed from the marina down the water. You guy's are a...

Service manager came out here and brought a digital tach. With the 14.25x21 pitch 3 blade stainless vengence prop that came with the boat at wide open throttle hit 52 on the garmin at 4300 rpms just like the tach guage on dash says,Well the speedo said 57 but I will trust the garmin at 52 with...

installed original 3 blade stainless 14.25x21 pitch vengence prop back and got the same results, 52 mph at 4350 rpms. service manager said he will try to get out here tomorrow to see for himself. Im thinking it's gotta be a bad tach or hooked up wrong. thanks for all the input.