Beta Backyard Kart 0.17.6

This update is primarily for the significantly more optimized 250cc engine mesh. I also found some minor details about the true original engine that was on the kart that make it much more fun to drive with, so I am now including that as part of the mod. It only has 9ft lb of torque, but the additional final reduction from the drivetrain made it work properly.

List of changes:

• Engines
  • A new mesh for the non-kart-based engines that use a CVT
    • 150, 250, and 450cc
    • Reduced poly count from 170k to roughly 25k.
  • A new 150cc engine
    • This is the engine that truly started the kart. I decided on the 250 because I did not realize that the 150cc engine had a much higher final reduction since it had the full drivetrain.
    • It needs a drive mesh to fully represent the IRL setup.
  • Adjusted some sounds
  • Separated exhaust breakgroup from the engine
• Suspension
  • Refined widened suspension
  • Refined widened suspension coilovers
• Wheels
  • Added a few skinny wheels
    • 10x1
      • WIP, but they are silly
    • 10x4 Scooter
      • This is the size of the wheel originally on the scooter the 150 engine came from
    • 6x1
      • Super floppy tires
    • 16x4 Dirt Bike
      • This is based on the rear wheel from a mid-2010s Honda CRF150
    • The motorcycle and scooter wheels use a stand-in mesh
• Powertrain
  • Updated powertrain to rotate longitudinally instead of transversely
    • This means the rear wheels should not lift under power since the torque will try to spin the axle
  • Added new diff for the new 150cc engine