MSA Kart Race Yearbook – 2011 http://www.msauk.org/uploadedfiles/msa_forms/goldbooks/Gold_Book_2011.pdf D3.3.11 Rear, front and side torsion bars are specifically banned. If a kart is manufactured with torsion bar options each bar must either be removed or welded permanently in place. If welded in place the torsion bars must be welded directly to the chassis permanently. Welding the clamps is not sufficient and it must be torsion bar to chassis direct welding. Torsion bar clamps must be removed. Although the exact method of welding is free (mig, tig, braze, etc) tack welds are not sufficient. The welding must be nominally continuous around each joint and at a minimum cover 75% of the circumference allowing for areas which may be difficult to access. The word permanent is stressed.
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