Hmmmm, I don't buy that....
No offense, but I don't believe that or else GRP would make a point that you can ONLY use GRP plugs and thats not the case. They recommend their plugs but make no mention that its mandatory....
I think if an different brand of plug "deforms" the button head or threads, they would definitely make it clear that was the case. How many engines would be ruined this way...
With my ninja, I usually run the OS plugs, but have used mugen turbo plugs, and O'Donnell turbo plugs after an OS without issue...
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 interchangable, 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.