Results 1 to 3 of 3
  1. #1
    rob2337's Avatar
    Join Date
    Jun 2007
    Montréal, Québec Canada

    Building 580 Yellow Engine - Compression Question

    I am building a 580 Yellow Engine for a friend. He wants the ski on the water for real cheap. We bought it with a bad crank and piston, so we are slowly building it up with used parts we find locally and on e-bay.

    The ski will be used just for cruising around.

    My question is about compression. Someone told me that when you buy a SBT engine, they lower the compression for the fact that they use questionable parts, people use questionable gas, and for added reliability. ( Don't want to get into a discussion about SBT engines)

    Should I try to lower the compression on this unit by doubling up on the cylinder base gaskets? I really don't care if I loose power, just looking for a slow bullet proof ski that can run regular gas.

  2. #2
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
    Join Date
    Aug 2007
    Tampa Bay, FL
    I'd just use the thickest base gasket... probably not a good idea to use two gaskets! SBT engines are junk!

  3. #3
    Tool Bag water worx's Avatar
    Join Date
    Aug 2006
    Sunny Fla
    Just put it together,it will be fine.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Compression on 580 Yellow motor ?
    By HDMM in forum 2-Stroke Performance
    Replies: 1
    Last Post: 09-05-2009, 10:47 AM
  2. 580 91 580 Yellow Engine Rebuild - Crank Seal Question
    By rob2337 in forum 2-Stroke Performance
    Replies: 1
    Last Post: 04-08-2009, 08:57 PM
  3. Compression question
    By christian gpr in forum Yamaha PWC Performance (2-stroke)
    Replies: 75
    Last Post: 04-23-2006, 02:52 AM
    By ABBOTT in forum Yamaha How To & FAQs
    Replies: 0
    Last Post: 02-15-2006, 10:30 PM
  5. RXT Engine Washing Question
    By BrAinZ in forum Sea Doo Open Discussion
    Replies: 7
    Last Post: 11-26-2005, 03:41 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts