Tire change:
https://www.youtube.com/watch?v=fGgdy3fRCbM
Setup will depend on track size, power, your weight, tires, tire pressures.
Setup Info:
http://karting.4cycle.com/showthread.php?1150-The-Msquared-Files
Thanks matt!
Go to 4 cycle.com and find the chassis forum for your brand chassis. That site is more dirt oval orientated.
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