Pls briefly explain how to calculate fuel % with shim thickness for 12-3SCT.
Why Novarossi factory ADVISE 16% fuel for .12 engine?


Fuel recommendation: This engine has been developed to be used with a fuel with a maximum of 16% nitro content and with an oil percentage not lower than 7%. We therefore suggest not to use it with different percentages compared to the ones specified here above.


Thanks in advance for the explaination...