Jim Lomas Chambers

H1

All measurements in mm. Lengths on top, diameters on the bottom. Couple of notes. On lengths, first number is exhaust port lenght, second is how much the spigot adds to the lenght. Regarding diameters, the spigot and header entrance is 40mm measured inside, the stinger/silencer tube is also measured inside at 24mm but the hole at the rear of baffle cone is slightly smaller approximately 22mm. The rest is outside measurements. Subtract 1.5mm from those numbers.