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Chassis Setup Guide PDF  | Print |  E-mail
Written by Vic R   

This guide makes it easy to improve kart handling for a typical kart in normal conditions.  Only testing will confirm these recommendations with your kart and driving style.

 

Oversteering at corner entry or there is too much front end bite.

Reduce jacking effect
  • Reduce scrub radius (remove one wheel spacer from both front spindles)
  • Increase rear track width
  • Reduce castor
  • Reduce Ackermann
Increase rear grip
  • Move weight towards rear of the kart
  • Remove 3rd Axle bearing (in low grip conditions)
  • Raise rear tyre pressure by 1 or more PSI or drop front tyre pressure by 1 or more PSI
Reduce front grip
  • Lower the front of the chassis
  • Reduce toe-out (1 mm is normal toe-out)
  • Remove or loosen front torsion bar and loosen crash bar
Driving
  •  Reduce trail braking


 

Understeering at corner entry (pushing out)

Increase jacking effect
  • Increase scrub radius (add one or more wheel spacers on both front spindles)
  • Increase castor
  • Increase Ackermann
  • Decrease rear track width
Increase front grip
  • Shift weight forward (seat, ballast)
  • Raise the front end of the kart
  • Add or tighten front torsion bar and crash bar
  • Use shorter rear hubs or softer axle
  • Increase toe-out (1-2mm is normal toe-out)
  • Raise front tyre pressure by 1 or more PSI or drop rear tyre pressure by 1 or more PSI
Driving
  •  Slower initial steering turn in


 

Oversteering out of the corner 

Increase rear grip
  • Raise and or move seat back
  • Increase (or decrease) width of rear track
  • Put longer (or shorter) rear wheel hubs on the axle
  • Add rear torsion bar or turn torsion bar to vertical position
  • Raise (or lower) any ballast on the rear of the seat
  • Raise the rear ride height
  • Change to a stiffer (or softer) rear axle
  • Add or tighten 4th rail
  • Add seat stays
  • User a stiffer seat
  • Raise rear tyre pressure by 1 or more PSI or drop front tyre pressure by 1 or more  PSI
Reduce jacking effect
  • Increase width of rear track
  • Decrease castor
Reduce front grip
  • Remove or loosen front torsion bar
  • Reduce front track width
Driving
  •  Turn later into corner 


 

Understeering out of the corner

Increase front grip
  • Move the seat forward
  • Add or tighten front torsion bar and crash bar
  • Use a softer seat

Driving

  • Reduce acceleration out of corner

 

Understeering all the way through the turn

  • Increase rear track width
  • Turn rear torsion bar to horizontal position or remove it
  • Loosen 4th rail
  • Increase front tyre pressure by 1 or more PSI
  • Is chassis bent?


 

Bounce in the rear (excessive)

  • Increase rear track width
  • Lower chassis height
  • lower seat height

 

 

Too little grip in all four tyres or there is not enough side bite

  • Decrease front and rear track width
  • Add or tighten 4th rail (normally should be tight)
  • Loosen the side pods
  • Raise the air pressure in all 4 tires by 1 or more psi
  • Raise (increase outside tyre bite) or lower (if outside tyres not able to cope with friction) centre of gravity
Driving
  •  Reduce steering movements


 

Too much grip in all four tyres (two wheeling around corners)

  • Increase width of front and rear track
  • Remove or loosen 4th rail
  • Lower the rear of the chassis (normally in highest position)
  • Tighten the side pods
  • Lower the air pressure in all 4 tires by 1 or more psi
  • Lower (decrease outside tyre bite) or increase (outside tyres not able to handle increased friction) centre of gravity

 

 

Lack of top end speed

Power related
  • Engine refresh (every eight hours)
  • Change sprocket
  • Change exhaust flex length
  • Change jetting settings
  • Change spark plug if fouled or select appropriate heat range
  • Check or replace fuel filter(s)
Friction
  • Check that brake pads are not touching brake disks
  • Check that front the wheel bearings are free spinning (should be able to turn with fingers)
  • Too much toe-in or toe-out
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