Results 1 to 2 of 2

Thread: 92 XP Pistons

  1. #1

    92 XP Pistons

    I tore into a 92 XP over the weekend after not being able to start - it came down to a comp check. I could only get about 110psi out of each cylinder. Whats the lowest comp level and still have one of these start?

    I took out the pistons and there was some decent scoring on the piston and cylinder walls right under the ring gaps on both upper and lower rings.

    The pistons said "Made in Austria" on the inside - are these the stock pistons (the engine does look original)??? Thanks!!

  2. #2
    wkuadam07's Avatar
    Join Date
    Feb 2013
    Bowling Green, KY
    Could be original... measure them and compare to stock bore dimensions...
    I've seen rotax engines with 90 psi start just fine OUT OF THE WATER, but anything under 100 PSI is very hard to get started in the water. I've seen them run for 2-3 more seasons with 110ish compression numbers...

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Best way to install pistons
    By Pistonwash in forum Yamaha How To & FAQs
    Replies: 13
    Last Post: 08-31-2008, 11:17 PM
  2. Just how much Boost can the cast pistons handle safely?
    By Pale Rider in forum 4-Tec Performance
    Replies: 45
    Last Post: 04-13-2006, 10:06 AM
  3. Best Piston
    By tmoschella in forum 4-Tec Performance
    Replies: 5
    Last Post: 03-04-2006, 08:38 AM
  4. Should i really be scared of my cast pistons?
    By 01xdime in forum 4-Tec Performance
    Replies: 14
    Last Post: 12-06-2005, 02:31 PM
  5. Pro X Piston question
    By spdracr in forum Yamaha PWC Performance (2-stroke)
    Replies: 7
    Last Post: 09-18-2005, 04:23 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