For my nephew (4 year old Honda Z50 rider). He can't quite touch the ground yet with both feet while starting. Several professional supercross racers use starting blocks at the gate.
Learn how to TIG weld and build parts like these here: http://www.6061.com
The best hand/finger amperage controller :http://www.6061.com/tigbutton.htm
motocrosssupercrosshonda
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