Results 1 to 2 of 2

Thread: Milled head?

  1. #1
    "Tearing it up on the water" seadoobutch787's Avatar
    Join Date
    Nov 2007

    Milled head?

    When i bought my 96xp back in the day it had a milled head that ran about 165psi in each hole. I since deto my engine and messed that head up after putting on a spec 2. Im kicking around having ppg mill my head to 170psi and .070 squish they state that is there level 1 kit mod. I have a stocker on my ski right now and it blows 145psi in each hole. When you have the head milled i know that you increase compression along with throttle responce but do you gain any extra top end rpms?


  2. #2
    96XPSS's Avatar
    Join Date
    Feb 2006
    Warner Robins, GA Home of the 2007 All-Star Little League World Champions!
    Sometimes. There is a fine line between too much compression not allowing it to rev out versus prop pitch too. With 170 it should increase your max rpms though. Guys running 230 lbs of compression...probably not.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Milled head speed and RPM results..
    By Fusion in forum Yamaha PWC Performance (2-stroke)
    Replies: 13
    Last Post: 01-06-2008, 02:40 PM
  2. milled head or Riva?
    By dogger in forum Yamaha PWC Performance (2-stroke)
    Replies: 10
    Last Post: 01-03-2008, 09:37 PM
  3. Milling Head...
    By james k in forum Yamaha PWC Performance (2-stroke)
    Replies: 2
    Last Post: 09-01-2007, 11:13 PM
  4. Jims Milled Head Questions
    By Chrisrokc in forum Yamaha PWC Performance (2-stroke)
    Replies: 4
    Last Post: 08-18-2007, 02:35 AM
  5. Milled head and 89 octane?
    By jfoster in forum Yamaha PWC Performance (2-stroke)
    Replies: 15
    Last Post: 04-07-2007, 11:58 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts