is that the engine you need spark plugs for? 50cc would be the heads not the headers. i always use ac/delco
Not sure what your specifics are, but on one of my Saturday car shows (used to be on Spike) there was a referenced recently to a shorter plug for header applications. Sorry I don't recall the specifics. Go to powerfblocktv.com and search their episodes. They have full episodes for viewing and also listings of products from them.