Originally Posted by
Eivind E
That's disinformation, all the Taiwan engines are designed to run the OS style plugs and most of them come with one or a copy. So it is infact the complete opposite, why would anyone choose to run a nova plug in it?
We went through this a few years ago on here. (search for it) I checked taper on a optical comparator and all plugs I checked at the time were the same taper. The Os plugs have relief where the taper meets the threads. Os does not tap their head buttons as deep as say a Nova. Putting a Nova plug in a Os will sometimes stop before seating the taper. Os plug in a Nova works fine but with the relief it tends to distort the head button so if you go back to Nova plugs it may leak.
Rex