Results 1 to 3 of 3
  1. #1

    What oversize should my 650 have?

    Hi
    I am looking for new pistons to my 650 sx. The former owned changed the cylinder width to 77mm from 74mm.
    Should I go for 1mm oversize pistons or 1,5mm?


  2. #2
    I thought I would buy from a close store, but can anyone point out which ones would be best for me?
    http://www.atvparts.biz/jet-ski-part...i-pistons.html
    The 77mm exactly or one size down (76,75mm)?

    Am I getting it wrong? How should I understand this piston size and then the width of the piston? Is it two different things?

  3. #3
    steve45's Avatar
    Join Date
    Feb 2008
    Location
    Texas
    Posts
    5,014
    +1
    285
    I don't know how much larger you can go. Normally, you want the smallest oversize so you can re-bore the cylinders in the future. Are you trying to fix a scoring problem, or trying to get more displacement. The increase in displacement isn't worth the effort, in my opinion.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. What voltage should my ski run at?
    By hill160881 in forum MSX/Matrix
    Replies: 6
    Last Post: 07-03-2014, 08:13 PM
  2. What level should my oil be, 2008 rxp-x 255 (pic included)
    By travis ingram in forum 4-Tec Performance
    Replies: 5
    Last Post: 05-13-2014, 08:18 PM
  3. What mods does my ski have?
    By CJ's gpr in forum Yamaha PWC Performance (2-stroke)
    Replies: 14
    Last Post: 10-08-2012, 12:41 PM
  4. What prop should I have in my ski
    By bruinsrme in forum 4-Tec Performance
    Replies: 2
    Last Post: 05-05-2008, 08:35 PM
  5. What should my rpm be??
    By DeeGee in forum 4-Tec Performance
    Replies: 7
    Last Post: 06-15-2006, 04:35 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
  •