Results 1 to 1 of 1
  1. #1
    skigolfnut's Avatar
    Join Date
    Jun 2009
    Location
    League City TX
    Posts
    1,979
    +1
    33

    Piston wash and ADA head domes part II

    I finally got a better compression tester and ordered some new O-rings from American Packing down the street, for the ADA head,
    I went back in with Viton that have a good heat tolerance, all the way around,
    I put the stock head on first to get a base pressure for the piston rings,
    mag-112
    cent-120-125
    pto-120 --all within tollerance a little worn
    Now back on with the ADA head with the 23cc domes
    mag-138
    cent-150
    pto-149 ---seems low for those domes
    Now the 21cc domes in and got this compression
    mag-152
    center-165
    pto-160--better that the 23's
    The mag piston is consistently about 8-10 lbs different, but that is the one that gets the hottest and wears out the quickest I am told,
    Who knows how many racers messed with these domes but 150-160 is OK by me,
    I am going to leave the 21cc domes in it for now, I have been running vp110 mix, I should be good,
    I will put the stock ride plate on, bump the drop nozzle up a bit so the nose doesen't plow so much and see where I am at,
    I have got to try and get my RPM's up,
    Thanks for everyons help and suggestions,
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	new polaris 035.jpg 
Views:	54 
Size:	63.2 KB 
ID:	263222  


Thread Information

Users Browsing this Thread

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

Similar Threads

  1. 785 Piston wash and domes questions?
    By skigolfnut in forum Polaris Open Discussion
    Replies: 13
    Last Post: 01-30-2012, 06:43 AM
  2. Piston Wash and Comp #'s
    By whiteyz in forum Yamaha PWC Performance (2-stroke)
    Replies: 9
    Last Post: 06-07-2008, 11:47 AM
  3. Piston Wash and Cylinder pics ?
    By SpeedJunky in forum Yamaha PWC Performance (2-stroke)
    Replies: 14
    Last Post: 03-04-2008, 10:24 AM
  4. Check piston wash and valves W/O taking off the head
    By 800AMSOIL4U in forum Yamaha Open Discussion
    Replies: 7
    Last Post: 09-14-2006, 07:15 PM
  5. Check piston wash and valves W/O taking off the head
    By 800AMSOIL4U in forum Polaris Open Discussion
    Replies: 2
    Last Post: 09-13-2006, 11:09 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
  •