how come my displacment sticker said 68.5 cc

Discussion in 'Introduce Yourself' started by animalatr, Jul 11, 2010.

  1. animalatr

    animalatr New Member

    ive had my bike for about 4 months and i cant find anything that says that displacment why
    and i also read on here that the biggest engine thats made is a (66) or what they call 80 is this true

  2. GearNut

    GearNut Active Member

    Yes it is true. The total swept volume (the volume displaced by the movement of the piston in the cylinder) is 66cc. The Chinese label these engines as 80cc because they also take into account the volume of the combustion chamber in the cylinder head.
    Combustion chamber volume really has no relevance in the engine displacement because there is no volume "displacement" in it. The cylinder head is stationary.
    It is marketing hype. 80cc sounds better in advertisement that 66cc.
  3. Fulltimer

    Fulltimer Member

    Mine doesn't even have a sticker.

  4. Stan4d

    Stan4d New Member

    Alot of the 66 and bigger stickers are removed. People removing anything that might cause leagal problems at first glance.
  5. animalatr

    animalatr New Member

    that still didnt answer

    does any one on here have a sorry if i dont spell this right but a pizhou youngxine motor thats the factory where it was made it didnt say 80cc or 66 cc or 49 or 60 it said 68.5 cc it also gave the max rpm and a couple of other things to but i tore it off so i would have any legal problems i just found it to be an odd number
  6. animalatr

    animalatr New Member

    so does that mean its whats clasifide as an 80
  7. GearNut

    GearNut Active Member

    Yes. An 80cc Chinese in frame 2-stroke is actually a 66cc.
  8. animalatr

    animalatr New Member

    so why does mine say 68.5

    does that mean its really a 66 when its labled 68.5 i feel like the chinese are lying to me
  9. GearNut

    GearNut Active Member

    It very well may be a 68.5cc, cylinder head volume included. I don't know what the swept volume is in those engines.
    As for the Chinese lying to you, It all marketing schemes. Sadly, lying or manipulating the truth in their favor is part of the game these days in many markets, not just Chinese MB engines.