Skip to content
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
Skins
  • Light
  • Cerulean
  • Cosmo
  • Flatly
  • Journal
  • Litera
  • Lumen
  • Lux
  • Materia
  • Minty
  • Morph
  • Pulse
  • Sandstone
  • Simplex
  • Sketchy
  • Spacelab
  • United
  • Yeti
  • Zephyr
  • Dark
  • Cyborg
  • Darkly
  • Quartz
  • Slate
  • Solar
  • Superhero
  • Vapor

  • Default (Slate)
  • No Skin
Collapse
Brand Logo

DT125R FORUM

  1. Home
  2. Technical Zone
  3. Engine
  4. Power loss

Power loss

Scheduled Pinned Locked Moved Engine
4 Posts 3 Posters 356 Views
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • A Offline
    A Offline
    AndyJay
    wrote on last edited by
    #1

    Think I'll have more luck with the lottery than I'm having with my 01 DT R atm 😂😂.

    Got a severe loss of power for some reason. Engine was reving fine in neutral and can just about get into the upper power band in first, but anything onwards it can't get past 5000 and idles at around 20mph. This all happened on my way home so haven't ran it since.

    I've taken the top end off the engine and the piston, rings and cylinder all look fine - no signs of wear. There's no play in the rod either so the bearings are good.

    Since buying it I've had a fair few seals go on it after running it in again - does this sound like it could be the left hand crank seal? I know the bottom end pressure is important with 2 strokes so could a leaking seal be preventing enough fuel getting pushed through into the cylinder when increasing the revs?

    I'm guessing it can rev okay in neutral as it doesn't have the load of the gearbox and drive train applied which could play around with the pressure too?

    Any advise would be greatly appreciated.

    1 Reply Last reply
    0
    • CalumC Offline
      CalumC Offline
      Calum
      wrote on last edited by
      #2

      If it was a crank seal it would idle high if its the LHS or smoke heavily RHS.

      It could be a number of things.

      This website has loads of information on power loss. Check the usual suspects. Worn clutch plates will cause high rpms low power.

      Always Originate, Never Pirate!

      1 Reply Last reply
      0
      • A Offline
        A Offline
        AndyJay
        wrote on last edited by
        #3

        I'll have a search about.

        The thing is the power to rev ratio wasn't an issue - the engine just wouldn't physically rev above around 5000 even with the throttle held open, as if it was in limp mode.

        declanD 1 Reply Last reply
        0
        • A AndyJay

          I'll have a search about.

          The thing is the power to rev ratio wasn't an issue - the engine just wouldn't physically rev above around 5000 even with the throttle held open, as if it was in limp mode.

          declanD Offline
          declanD Offline
          declan
          wrote on last edited by
          #4

          @AndyJay was it wet out?

          1 Reply Last reply
          0
          Reply
          • Reply as topic
          Log in to reply
          • Oldest to Newest
          • Newest to Oldest
          • Most Votes


          • Login

          • Don't have an account? Register

          • Login or register to search.
          • First post
            Last post
          0
          • Recent
          • Tags
          • Popular
          • Users
          • Groups