top end

what is the cap of a top end called (where the sparkplug is held).

The head

Terminal Nut

what is the cap of a top end called (where the sparkplug is held).

Air filter. Don't listen to those liars.

Is yours chrome?  It makes a huge difference.

Late model bikes, it is called a COP (Coil Over Plug). I assume you meant this for a Yamaha 250 F, right?

Aha, detective William does some sleuthing, looks at the OP's other posts and deduces he has a 250f Yamaha. :applause:

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