i just today got a 120 surpass that has been converted to gas. don't know anything about it. i know it has ch ignition,a flywheel with another plate behind it with a linkage attached to the throttle,to advance timing,and a neat looking glowplug that looks like a spark plug on top,that is about all i know. the guy i got it from said it made alot more power on gas,then on glow. that remains to be seen. he also said the kit's components would work on a saito 120 as well. dunno.