Eh? The BP6es spark plug came with a "nub" head

[andylawcc]

Just to double check , I am suppose to twist the "nub" thing off and expose the metal threads right? (Talking about the top end of the spark plug facing the spark boot, not the 'cylinder' end)
And the original spark plug boot/cap will only allow the "thread" type head to be inserted right ?

I tried using bare hands and it won't twist off, just want to double check before I break something .

[650mark]

correct. gently use a pair of pliers to twist the threaded cap off of the spark plug. no harm to the plug. you might want to put some anti-seize thread paste on the sparkplugs before you screw them into the engine. makes them much easier to remove next time.

[andylawcc]

Thanks ! The plugs went in and the bike sounds good with the new plug.