I have a Honda HRN216VKAD, with the GCV170 engine bought new in the box from Home Depot on line this year. The engine model is GJAUA 2361122MY03 with a punch mark on the data plate and blue dot so the recalled camshaft on these engines was done I assume at the factory. 12 Hours run time, Well I get a nice puff of smoke on startup after it sits a while, way above normal, seems like a valve stem seal but please, (oil levels and all that is correct) the Authorized Honda dealer here here charges $95 to determine if it is a warantee issue. refundable but so I really have to make sure I am right, or at least it is a warantee issue. Would a compression test tell me anything? Thank you