O.S.Speed 2C604120 - R21 Low Nitro Combustion Chamber
Innerhead For R21 1/8 On-Road engines with 16% Nitro.
Recommended shimming on the R2105 engine for 1/8 on-road:
Use a 0.15mm shim
Compatible with:
R2101
R2102
R2103
R2104
R2105
R21(BLUE HEAD)
R21 EURO, R21 EUROII
R21 SHIMO, R21 SHIMO II
R21-M05 Marine Engine