The engines run best with the Radical pipe (best mileage/power) you can also use an 053, I have never used the 053, but have been told it works very well. always alwasy always use an OS P3 plug, the engine seems to run far better and cooler, engine temps should be around 185 to 200, if your running much hotter than that you more than likely not getting the full potential out of your engine.

I good starting point for the carb is 2.5 turns IN from flush on the bottom, 2.0 to 2.5 out from closed on the top. this should get you in the ballpark, the most important is the bottom.

The one down side of these engine are that they will run even if they are way out of tune. I have spent countless hours testing and tuning these engines, they tune a bit differently than most other eninges on the market today. but once you find the sweet spot you will be amazed.