DemonX Pitbike

Question:

My pitbike when put into gear will not go, it just revs. I have drained the bike but the problem persists, any feedback would be much appreciated, thank you. {Michelle, Lincolnshire, UK 2009 DemonX DYX140 pit bike}

Answer:

At the time of writing this page (August, 2012) a 2009 Demon X DYX140 should still be under warranty, so if our suggestions do not fix your problem, or sound like something you are not interested in tackling yourself, you may be able to get help at a local dealer. The DemonX Racing website does not list locations of its dealers but does have a telephone number and email address.

I have located a few sites with DemonX information. No online manuals or fiche though. They do not appear to be available is the US. Some sites list the 140cc model as a DYX140, some as a DX140. All refer to the engine as the YX140, a 4 stroke, 1 cylinder, 2 valve, air cooled engine. Additional specifications are listed below.

Now, on to your answer. The first thing you need to do is check the clutch cable for free play. If the cable is too tight, the clutch is actually disengaged, preventing your bike from going into gear. There is either an easy adjuster located on the cable at the handlebar or two nuts on the cable casing near the right side engine cover. Try turning these adjusters to give the cable additional slack or free play.




Your second task is to try to roll the bike without holding in the clutch lever. If it is in first gear, it should not roll freely. If it rolls freely and your clutch cable has free play, then the clutch springs may have failed or the clutch hub nut has come loose. If it will not roll and the clutch cable is ok, the inner clutch parts {plates, springs} are good.

It is possible that your machine has a clutch adjustment under a plastic cover on the right side engine cover. If you do not see a plastic cover, the adjustment may be internal. In that case a visit to your local dealer is in order.

If your bike is still under warranty, removing the engine side cover yourself or having a mechanic do it for you may void your warranty. Your owner’s manual or paperwork you received when you purchased the bike should have some information about warranty service.


Bike Specifications:

  • YX Motor Sport 140cc
  • 14/12 SDG wheels
  • KMC chain
  • Pro grips
  • Washable Foam air filter
  • Super Grip seat
  • Molkt 26mm
  • Engine type: 140cc XY Motor, 2-valve, 1-cylinder, air-cooled, 4-stroke
  • Bore x stroke: 54 x 54mm
  • Piston swept volume: 128ml
  • Compressing ratio: 10.1:1
  • Max torque: 9.2N.m / 8,500 - 9,000rpm
  • Max power and speed: 8.8kW / 9,000±620rpm
  • Idle speed: 1,500 ±150rpm
  • Clutch type: manual
  • Starting method: kick
  • CDI Ignition
  • Transmission: 4-speed manual clutch (1-N-2-3-4)
  • Min. fuel consumption: 359g/kW/h
  • Chromed 32mm exhaust with alloy end can (muffler)
  • Fully braided brake hoses with 2 pot hydraulic brake calipers
  • Chromolly double tubed cradle frame with powder coated finish
  • Alloy swing {arm} annodised in Demon Graphite colour
  • Demon X rear shock with 1000lbs spring rating
  • Reinforced poly resin fuel tank with CNC alloy fuel cap
  • USD front forks annodised gold with chromed stanchions
  • Forged alloy yokes annodised in Demon Graphite colour
  • Stainless steel foot pegs
  • 2mm steel engine guard, powder coated black
  • High impact polymer plastics with DemonX 3m quality graphics
  • 5mm steel tubular handlebars with matt black powder coated finish
  • 20mm foam bar pad and DemonX cover
  • 14/12 inch SDG wheels with matt black, powder coated finish on hubs and rims

  • Find new and used DemonX parts, accessories and bikes on eBay UK.




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