421x (VERIFIED)

: Many racers find the stock springs too soft for competitive racing. Consider upgrading to stiffer TRF options for improved corner entry and stability.

: The kit includes multiple top deck options (one-piece vs. two-piece). Use the two-piece deck for more flex and mechanical traction on lower-grip surfaces. : Many racers find the stock springs too

: Follow the Blog Kentech Build Presentation for a deep dive into weight comparisons and assembly nuances. two-piece)

is designed to be highly adjustable for different track conditions. is designed to be highly adjustable for different

: Download the TRF421X Assembly Manual for the full parts list and exploded diagrams.

: Monitor the motor mount position. It can shift slightly after several runs, especially if you only use the rear screw hole; using the front screw provides better stability.

: If you experience breakage, some racers have successfully swapped in more durable caps from the previous TRF420/420X models. 📋 Resources & Manuals