spark plugs, omwe amadziwika kuti mapulagi amoto, adzagwira ntchito ngati phokoso la piezoelectric discharge high-voltage kuchokera ku nsonga yamoto (fire plug), yomwe idzaphwanya mpweya pakati pa ma electrode a spark plugs, kupanga magetsi oyaka moto. kusakaniza kwa gasi mu silinda. Mikhalidwe yoyambira ya injini yogwira ntchito kwambiri: mphamvu yayikulu yokhazikika, kusakaniza kofanana, chiŵerengero chapamwamba cha psinjika. Magalimoto okhala ndi injini zoyatsira mkati nthawi zambiri amagwiritsa ntchito mafuta a petulo ndi dizilo. Pamsika wamagalimoto ku China, magalimoto amafuta amakhala ambiri. Ma injini a petulo ndi osiyana ndi injini za dizilo chifukwa petulo ili ndi malo oyaka kwambiri (pafupifupi madigiri 400), zomwe zimafuna kuyatsa mokakamiza kuti muyatse kusakaniza. Kupyolera mu kumaliseche pakati ma elekitirodi kubala zipsera, mafuta injini ndi mwa mafuta ndi gasi osakaniza kuyaka nthawi yake kupanga mphamvu, koma monga mafuta mafuta ngakhale mu malo kutentha ndi zovuta mowiriza kuyaka, kuti kuyaka yake yake ndi zofunika kugwiritsa ntchito "moto" kuyatsa. Apa kuyatsa kwa spark ndi ntchito ya "spark plug".
