Originally Posted by
stanleyw808
Hello houston,
Is there any reason why we should keep using OS Plug on Novarossi engine when we already have been using it?
I noticed that the lower taper side of the Turbo Plug is a bit different between Novarossi and OS.
Is this the reason?
Cheers..

yes .... its a long standing debate ... i know for fact that the short sealing area on OS plugs distorts the novarossi head button ...
hope this helps