This is a easy answer NO unless you want to compete in Vintage events.
Engine parts for this model were difficult to get for the 242. My friend in Pa. was happy to get the last known new piston for his bike a few years ago at Mid Ohio swapmeet. Maybe things are better now? My understanding other model Montesa trials bikes have a better supply of parts.
If you compete in Vintage trials I believe the 242 is a GREAT bike, sort of a interim from old slow rev ving heavy bikes and has snappier power and lighter weight.