Results 1 to 3 of 3
  1. #1

    Join Date
    Jun 2010
    Location
    GTA , Canada
    Posts
    54

    34cc domes in a NPV 1200?

    Got this head used, domes have "34" stamped in them. It is a Greater head. I assume these are 34cc? Safe to run on a 1200 with 92 octane pump fuel and a riva enhancer? Going in a freestyle ski so it won't see much extended WOT use. Thanks!


  2. #2
    Myself's Avatar
    Join Date
    May 2007
    Location
    North Central Arkansas
    Posts
    2,772
    +1
    129
    I'm guessing a 34cc head on a 1200 65u would put the compression in the 170+ range. Great for race fuel. I believe for a pump gas 65u you should be around 40cc.

  3. #3
    Mpeavler's Avatar
    Join Date
    Dec 2005
    Location
    Anderson, Indiana
    Posts
    5,155
    +1
    170
    170-175 PSI....way outside of 93 range....more so with advanced timming. I would not run over 160's on pump fuel....although short bursts you may have....you will also have the pump out of water a lot making a ton of heat...adding to Detno problems....

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Any Interest in Yam 1100/1200 Custom Laydown Triple Pipes
    By JNB421 in forum Yamaha Old School Skis
    Replies: 12
    Last Post: 11-19-2011, 10:25 AM
  2. HELP! Exhaust leak in 2002 Virage 1200?
    By tenjuna in forum Polaris Open Discussion
    Replies: 12
    Last Post: 08-23-2011, 02:06 PM
  3. FS 2006 triton double lt in Richmond VA $1200 like new!
    By beachboy66 in forum Trailer Classifieds
    Replies: 1
    Last Post: 11-09-2010, 12:27 PM
  4. Dialed in! 1998 GP 1200, finally...
    By Sydwayz in forum Yamaha Old School Skis
    Replies: 4
    Last Post: 07-21-2010, 07:32 AM
  5. 07 1300 in a 2001 1200 hull
    By seaya in forum Yamaha PWC Performance (2-stroke)
    Replies: 3
    Last Post: 03-16-2010, 09:23 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
  •