Results 1 to 2 of 2
  1. #1
    dhoad's Avatar
    Join Date
    Aug 2005
    North Aurora, Illinois, United States

    Question need xlt 800 compression/psi

    I am hoping somebody can give me the compression on xlt 800 or gp800r. I am having lowell do port and head work on wifeys ski and he needs a stock psi to work with for cutting head.
    If any body has worked an 800 motor I would appreciate any input also.
    I am adding vf3s, carbs reworked, grate, plate, prop, advancing timing for starters

  2. #2
    cfgp927's Avatar
    Join Date
    Dec 2005
    Warsaw, Missouri


    I have seen stock 800 motors range in compression from 120psi to 135psi. All used the same Matco gauge for measurement. My most recent engine started with a compression reading of 128psi and 130psi (front/rear). Hope that helps. Also with most of my modified motors I have found that compression in the 155-165psi range results in the longest lasting, most pump gas friendly motors. I'm sure Lowell can get you fixed up.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. 2003 xlt 800 neww engine but slipping?
    By da1070 in forum Yamaha Open Discussion
    Replies: 2
    Last Post: 06-06-2013, 07:16 AM
  2. FS 2000 XLT 1200 needs work $800
    By Va Superjet in forum Yamaha Classifieds
    Replies: 1
    Last Post: 07-13-2010, 06:15 PM
  3. 2002 XLT 800 questions?
    By pe4me in forum Yamaha Open Discussion
    Replies: 7
    Last Post: 05-12-2009, 11:19 AM
  4. Need Untouched 800 Grate.................
    By WATER WOODY in forum Yamaha Open Discussion
    Replies: 11
    Last Post: 09-08-2008, 10:14 AM
  5. anybody modded xlt 800
    By dhoad in forum Yamaha PWC Performance (2-stroke)
    Replies: 3
    Last Post: 07-04-2006, 09:34 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