Bully for sure. It is the most used clutch in karting and is the most copied and "redesigned"
Vortex is good also, with a completely different design.
Cant beat a better guy than David Martin though, very friendly and easy to talk with.
I like this one! 12 tab bully and pound or 2 lighter
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I tried about everything . Cept this .NORAM, put a penny in the drum and you can even push start