I think I should CR this flop instead of leading it, right? What's a good amount?

Absolute Poker No-Limit Hold'em, $0.10 BB (6 handed) Converter Tool from (Format: FlopTurnRiver Cards)

Button ($15.60)
SB ($1.90)
Hero ($11.20)
UTG ($7.08)
MP ($18.35)
CO ($15.30)

Preflop: Hero is BB with , .
UTG raises to $0.5, MP calls $0.50, 2 folds, SB calls $0.45, Hero calls $0.40.

Flop: ($2) , , (4 players)
SB checks, Hero bets $1.75, UTG raises to $6.5

HERO? Obv fold right?

I would definitely check this flop because of your relative position. If you check you get to see what UTG does as the preflop raiser and then how MP and SB react. If UTG bets and MP & SB folds I think a checkraise is best.

Given just about any other action I'd just check-fold.