cowboy10,

Moki engines are designed to run on FAI fuel:
20% castor 80% methanol (0% nitro!)
They tend to overheat and loose some power when running on nitro fuels.
Do not ever run them on synthetic oil only. You shorten their lives.
If you want to use synthetic fuel make sure at least half of the oil content is castor.

regards,

Zaquron [from Hungary where Moki's are made ]