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Spark plug bit black


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Yes, of course it`s black - Vitorrazi supply their engines with a rich (safe) factory carburetor setting to keep it cool and increase reliability at the expense of efficiency.

You can keep it set as it is if fuel consumption is not a priority and just enjoy hassle-free flying or tweak the mixture to gain more flying time per litre if you have some experience in tuning carburetors and are confident that you are not going to do any damage by running too lean.

A symptom of over-rich idle mixtures on the Moster though can be excessive vibration at idle ("four stroking") which can be a contributory factor to the infamous Moster exhaust breakages (probably only on the direct-driven non-clutched models?).



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