No problem! It is not "published" to double up on the exhaust valve clearance in the Service Manual. But in some tech info it states the following: The adjustment setting for all Stihl 4-Mix engines is 0.1 mm (.004) when engine is cold. This is the minimum gap to use for setting valves, but a gap as wide as 0.3 mm (.012) is acceptable. It has only been an issue on the BR's as opposed to shafted product, and only on the exhaust valve.