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Old 06-23-2009, 04:27 PM   #1
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Default Head Shims for 30%

Guys i have a AXE Rossi Cobra .21 motor and would like to know if i need to add any shims are take in out to start running 30% fuel and how many shims should be on the motor to run 30%.All so what do you guys think about O'Donnell fuel.
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Old 06-23-2009, 04:32 PM   #2
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As a general rule of thumb 0.6 shims in total for most engines.

Check the manual if am not mistaken odonnel fuel is mainly synthetic. Some engines like to have a caster and synthetic in the mix.
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