I bought a used Q-500 with a Rossi .40 five years ago and it's been sitting in my closet until last weekend. I decided to dust it off and sell it, but the Rossi takes a plug with an o.d. that's slightly larger than a standard plug. I know nothing about Rossi engines, but this one has a gold head. Is that an aftermarket head, and if so, does anyone know what plug this could possibly be and where I could get one? Thanks for your help.

I believe it may be a "standard" Rossi "Turbo" plug used in their higher performance engines? If it has no washer under the top and the nose is tapered, then its probably one of these? Try here, http://shop.vendio.com/rossienginesusa/category/8/
Jim W

thanks.