Results 1 to 2 of 2

Thread: Gpr Ported

  1. #1

    Gpr Ported

    HI people

    When you do porting and advance timing and STAGE II From riva and VF3

    what kind of prop should i use

    DF 14/20 or Re pitch DF 15/23

    Kind of lost here

    we need to get 80+ the soonest.......

  2. #2
    Duke's Avatar
    Join Date
    Jul 2006
    Well thats kind of a loaded question.

    Start with asking your portsmith the target rpms. With a good aftermarket tach collect the rpms with the 14-20 and start adjusting form there one degree at a time.

    Remember you can always add a degree to the trailing edge of a dynafly but you can't go backwards. The outer diameter grows as the degree increases and the blades must be cut to fit the liner. I would use the 85 mm nozzle and if you go a little to far the 87mm can possibly bring it back.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Yamaha gpr ported
    By Gprzack in forum Yamaha PWC Performance (2-stroke)
    Replies: 2
    Last Post: 06-18-2015, 08:31 AM
  2. FS FS 2003 GPR Ported Big Bore.
    By txgp1300r in forum Yamaha 2 Stroke Skis
    Replies: 17
    Last Post: 04-03-2012, 11:42 AM
  3. FS Part Out: 2000 Yamaha GPR [Ported 1300 w/ Triples]
    By Black Z-24 in forum Yamaha Classifieds
    Replies: 67
    Last Post: 08-14-2010, 05:27 PM
  4. FS 2005 GPR Ported
    By SpeedJunky in forum Yamaha 2 Stroke Skis
    Replies: 29
    Last Post: 05-26-2010, 08:32 PM
  5. Gpr ported cylinder & piston
    By rpmstepchild in forum Yamaha Classifieds
    Replies: 2
    Last Post: 08-14-2009, 12:06 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