Reply To: 2021–NSR Formula 86/89 Home › Forums › Club Races › Racing Calendar, Classes & Regulations › 2021–NSR Formula 86/89 › Reply To: 2021–NSR Formula 86/89 October 13, 2021 at 4:06 PM #17012 chapracer65Participant So is the “standard NSR sized grub screw” the NSR 1238 M2.5 grub screw or the NSR 4809 M3 grub screw? Russell
