LM1 Header pipe diameter

Is the standard diameter 38 or 40mm? I thought 38 but I think Falloon’s book says 40? Both sizes are available

Yours mystified

Will get vernier on mine and report back latr…

I thought 38 with 40 being the performance upgrade

Mine are 38…

Great thanks for the confirmation. Terrific pic; only time I have a bike that far over is when I drop it :slight_smile: