Sorry for the dumb question but, what is the proper spark plug for my 85 garelli monza gt? There is a sticker on the tank that has the info on it is worn away. I have been using an ngk from a IT250dirt bike.
The bike runs well at high rpms but down low it will hardly pull itself. A week ago it ran fine. I guess the plug would be the first place to start. Any thoughts would help.