Several searches have yielded different answers. Is the pilot jet that comes stock a different series than what is used to replace it? The OEM pilot appears to be a 26 series and the recommended replacement is a longer 21 series. Does that sound correct? The OEM shorter pilot is recessed into the carb while the 21 series appears to be flush. Also someone gave a part number for a hex style main. I bought the 8mm round to replace the the same style OEM main jet. Which is correct?