Results 1 to 3 of 3

Thread: Balance shaft ?

  1. #1

    Join Date
    Mar 2011
    New Zealand

    Balance shaft ?

    Is the balance shaft really needed on a xp 951 ? It's just more weight to turn to limit performance isn't it ?

    anyone run with balance shaft removed ? first two stroke i've had with a balance shaft

  2. #2
    SURFnTURF's Avatar
    Join Date
    May 2007
    Yes have run without it but I wouldn't do it again.They do work rather well.Didn't notice any gain in throttle response as they dont need a lot of effort to get them spinning as they have a very small centrifugal weight displacement.The engine felt very buzzy and I wouldn't rev it into the 7k for too long as it felt like when you misaligned the balancer shaft to the crank by 1 tooth. Just doesn't feel its going to hang together for too long

  3. #3
    Moderator RX951's Avatar
    Join Date
    Apr 2005
    League City, Texas
    The balance shaft is necessary to help reduce the harmonics of the moving parts and counterweights of the crankshaft at a minimum.
    a balance shaft is an eccentric weighted shaft which offsets vibrations in engine designs that are not inherently balanced.

    Here is good info to read on about balance shafts.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. balance shaft interchange
    By porschemaniac in forum 4-Tec Performance
    Replies: 0
    Last Post: 08-25-2011, 08:00 PM
  2. Help synchronizing balance shaft
    By bminchey in forum Sea Doo Open Discussion
    Replies: 6
    Last Post: 02-21-2011, 10:40 PM
  3. 4-tec crank and balance shaft
    By Green Hulk in forum eBay Finds
    Replies: 0
    Last Post: 01-26-2010, 09:07 PM
  4. Balance shaft oil....
    By maxdoc in forum 2-Stroke Performance
    Replies: 95
    Last Post: 08-12-2008, 10:03 AM
  5. crank to balance shaft timing ?
    By jetskibill9999 in forum 4-Tec Performance
    Replies: 3
    Last Post: 01-26-2008, 12:35 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