carb =
https://www.towerhobbies.com/cgi-bin...p?I=LXCA62&P=7
I had to make an adapter from carb to the engine. I have a small metal lathe so no biggie. The Os carb has a slit cut for idle positions and it will deliver more fuel to the engine so you can get it to run at a fuel rich setting at full power. The stock carbs on the early versions would not deliver enough fuel to the engine. No other mods needed.Again I heard they redesigned the carb to an identical version of the OS a year or two ago , so the newer engines do not need any upgrades.
I run 9% oil and 10% nitro. I buy a gallon of methanol on ebay for like $20 and a gal of Cool power 20% nitro . combine the two, into two gallons= 10% nitro and 9% oil