Always Black Helmet on Motorcycles
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First of all: Backup x64v.rpf
What you need: OpenIV

Franklin
Go to: x64v.rpf\models\cdimages\streamedpedprops.rpf\player_one_p
Replace Texture: p_head_diff_006_a.ytd to *_i.ytd

Trevor
Go to: x64v.rpf\models\cdimages\streamedpedprops.rpf\player_two_p
Replace Model: p_head_009.ydd, p_head_011.ydd and p_head_023.ydd
Replace Texture: p_head_diff_009_a.ytd to *_p.ytd, p_head_diff_011_a.ytd to *_h.ytd, p_head_diff_023_a.ytd to *_f.ytd

Michael
Go to: x64v.rpf\models\cdimages\streamedpedprops.rpf\player_zero_p
Replace Texture: p_head_diff_011_a.ytd to *_h.ytd