KTM 250sx or 250sx-f

Ncconst1

New member
I’m new to Karting. Currently building an Intermediate Outlaw kart for my son. Wanting to know thoughts on engine selection. Trying to decide between KTM 250sx and KTM 250sx-f. What are y’alls thoughts and opinions? Thanks
 

flattop1

Dawg 89
Is one a four stroke ?
Is there a weight break for the 2 stroke ?
 
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