I have always used Maxima Castor 927 premix and have great success with anything from my daily drivers to full bridge ports running nitrous. You can find this stuff at most motorcycle shops that sell dirt bike supplies.
I have a case of Indemitsu that I will be switching to (at least to try) after I finish with my current bottle of Maxima.
I have always used a ration of 3.5 ounces per 5 gallons. Been running this ration/combination since the early 90s and never had a failure.
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