Whilst all the advice given is very good, let it be noted that gassers in fact vibrate less than glow engines, due to the controlled ignition if the mixture. In the heyday of gassers, these engines were much larger than modellers were used to, and those large chain saw converts vibrated more than a .60 of course. Of nowadays practice, if a 1.60 glow is compared with a 1.60 gas, the gasser vibrates less.