Results 1 to 6 of 6
  1. #1
    xplayer2885's Avatar
    Join Date
    Sep 2006
    Location
    LI, NY
    Posts
    1,251
    +1
    43

    Think i found what caused my piston burn down.

    Last fall befor i left for school i had issues with the 750. I had 125, mag, 125, cen, 90 pto. I had taken the carbs apart to take a quick look at the time an they looked crappy. Now after doing a full analysis this is what i concluded. The diagphram was very streched out compared to the new one, not sure if this has an effect on carb operation but im sure it does. The pop off was set wayyy to high, the high speed needles were worn, an there was crusty build up on the inside of the carbs. Not only that but gas would leak out of the atmospheric vent. Can some one explain that one to me? Ill post pics of the removed piston an carb guts tommorow night. Advice is needed


  2. #2
    I like Boobs. wetwolf's Avatar
    Join Date
    Nov 2005
    Location
    The NSA know's that I'm in Spokane, WA
    Posts
    804
    +1
    106
    If you are still running the stock fuel pump, then thats your problem, aside from prolly needing a carb rebuild.

  3. #3
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
    Join Date
    Jul 2007
    Location
    Cedar Rapids,Iowa
    Posts
    6,381
    +1
    23
    Take a good look at the small screens inside the carbs, If the diaphram has a small tear it would allow fuel to the other side of it.

  4. #4
    xplayer2885's Avatar
    Join Date
    Sep 2006
    Location
    LI, NY
    Posts
    1,251
    +1
    43
    The screens look fine, like they were replaced, but they cheaped out an didnt do the whole carb job deal. I placed the diagphram on a flash line an u can see pinholes in it. Hence why gas was leaking out of the carbs. Pics of the diagphrams an piston will be posted later tonight.

  5. #5
    XLTNoob
    Join Date
    Jul 2007
    Location
    Baytown, TX
    Posts
    400
    DIAPHRAGMS CANT BE TRUSTED

    just ask any baby boomer!

  6. #6
    bowsniper's Avatar
    Join Date
    Aug 2008
    Location
    macomb,michigan
    Posts
    5,896
    +1
    6
    If the needle is worn, it wont seat correctly and will let gas thru just as if you held it open with your finger. or as if the spring to keep it down was broke,missing, or bent or in your case, the needle was worn n crusty!. As the temperature outside rises, the heat causes the gas to expand and can move without the ski running.. guys recommend that your turn the fuel selector to the off position when not in use.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Any ideas what caused this piston to do this?
    By diamondwatercraft in forum 2-Stroke Performance
    Replies: 9
    Last Post: 08-01-2016, 01:24 PM
  2. Lets play a game: What caused this piston damage?
    By burtonrider10022 in forum Polaris Open Discussion
    Replies: 13
    Last Post: 07-07-2013, 08:41 AM
  3. Replies: 9
    Last Post: 01-05-2011, 05:07 PM
  4. What caused this Piston Damage - Ultra 150
    By hotshotbz in forum Kawasaki PWC Performance (2-stroke)
    Replies: 14
    Last Post: 01-27-2010, 04:26 PM
  5. Think i found root cause for my lean piston
    By xplayer2885 in forum Polaris Open Discussion
    Replies: 4
    Last Post: 11-14-2007, 10:04 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
  •