Hi. I have 2 of these engines converted, and I don't run a needle bearing. Just run CH Ignition and 10 to 1 oil ratio as per the response from TKG (who by the way is CH Ignitions) and you will never have a problem. Also, run the stock carb, it works with gas ok after proper tuning. But, best power will be on FAI fuel [no nitro, just 80/20 methanol/oil] w/ignition. You will be amazed at the power it will develop.