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  1. #1
    Join Date
    Dec 2005
    Pueblo West

    Z521 with 250 SHO at high elevation.

    On the Z521 what prop to pad height on this boat? I have a 23PT1 ventless on the boat right now (high elevation 4600 ft) and I moved the jack plate through all the ranges and the holeshot was terrible unless the JP was at max height. When I got on plane and started to trim I had no bow lift and the rooster tail was about 20Ft. tall. I expected 64 to 65MPH up here but only got 59. I got 61 MPH when I dropped the motor to 4 1/2 below pad but then I was only turning 57K on the tach. At 3 1/2 I turned 59K but 59MPH and the roost was huge. I do not think the 23P ventless is grabbing and providing lift. I am working with the dealer to try to get me a 23P FXP to see if it will lift. If it does and the holeshot still sucks I will have to have some vent holes put in the prop. So I am curious about what you guys think and what the pad height should be on this boat(estimate). Is it hard to get lift on this hull?

  3. Member
    Join Date
    Oct 2010

    Re: Z521 with 250 SHO at high elevation. (FSR1)

    I have the same boat decided to get a hydraulic jack plate when I bought it,to solve any problems in tweaking the manual jack plate .boat is still new have only had it out 7 times and opened it up twice 71 both tanks full two men full tournament load.I believe once I feel comfortable it will do 73
    2012 Ranger Z521
    250 Yamaha Sho
    Picasso Lures
    Smelly Jelly

  4. Member
    Join Date
    May 2014
    Southern Utah
    Did you ever find the correct prop, pitch and p2p for your SHO at high elevation? I have a similar problem here in Utah and am looking for suggestions.

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