Originally Posted by
Kodak Hodak
The OS comes with 2 x shims
i have ran for a few months with both inside, instruction book says 2 shims for 30% nitro
1 shim = 16% nitro
maybe my fuel mix is bad - 10% synthetic 5% castor run AT Red Nitro Fuel 16% content
plug either Nosram 6 or 7
OS TZ had 2 shim, one is 0.1mm and other is 0.2mm
16% nitro -> 0.1mm (I also used 0.1mm in FEMCA (Mecamo 16%))
20-25% nitro -> 0.2mm
30% nitro -> 0.3mm
i am using Cosmo 25% and TZ head shim is 0.2mm..
i had no problem in TZ and very fast!!