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  1. #1
    Member
    Join Date
    May 2019
    Location
    Eastern, KY
    Posts
    8

    Z19 with 175 Optimax pro XS PROP size and rpm help us

    Long story short I was out breaking in my new z19 with a 175 Optimax in her and was only seeing 5000 rpm and speed about 56 top (after I was able to trim it up).

    Was as wondering if anyone had any advice I should be getting more rpm and a few more mph I’m thinking. What prop would be best on it?

  2. Member
    Join Date
    May 2008
    Location
    Ankeny, IA
    Posts
    1,354
    #2
    Do you have a hotfoot?

  3. Member
    Join Date
    May 2019
    Location
    Eastern, KY
    Posts
    8
    #3
    Ya I do have a hotfoot. Also front what I’m reading on my throttle arm I have a gap of .08. From what I can find it needs to be about .02 which isn’t much I guess

    Also so the prop is a tempest plus 23p
    im thinking I need the 24p

  4. Member
    Join Date
    Mar 2014
    Location
    State College, PA
    Posts
    1,315
    #4
    If you're at 5000 rpm with a 23, going to a 24 is only going to lower your rpms. Lots to check:

    1. Prop to pad measurement
    2. Hot foot adjustment (See Merc boards on how to check)
    3. All cylinders firing?

    I wouldn't expect to see much more than 60 with a 175 on the z19.
    2015 Nitro Z-7 175 Pro XS