Originally Posted by
ezveedub
Thats because the taper on the OS and GRP plugs are different. They are close, but different. I've seen people use OS, GRP and Sirio plugs as interchangeable, but they have some slight variations. I have seen someone screw a OS plug in a Novarossi and it pushed the top of the combustion chamber in, so now a Novarossi plug will never seal correctly in that button anymore.
Since no one seems to really know what plugs are similar/compatible, I'll figure this out for us. First close up look is a Novarossi vs GRP. Next I'll get a hold of an OS, then the ODOnl plug and we will see.
DO NOT use Nova plugs in your GRP! Strike #1.... RB and Nova are exactly the same taper so don't use those in your GRP either.
