New TRJ Karting Builder Valve Springs last longer, than the competition !!!!
Our NEW Builder Valve Spring is the best spring available, period !!! Regardless of class these springs are the new standard for "legal" box stock springs.
We recommend running these springs on the dyno before setting, out of the package these spring check between 18.9-19.1. Once these springs are heat cycled they will maintain their tension.
We recommend that these springs be installed by an experienced engine builder. These springs may require sanding to meet spring pressure tech requirements.
Sold individually and All Springs are painted pink.