Bonjour.
50bhp isnt much strain at all and i would only go for a wet kit as its far easier to install and more reliable, due to installation.
you can run 50bhp all day no probs with appropriate ignition retardation and as long as your plugs dont promote pre ig.
Mechanically its strong enough, dont worry, so long as you dont decide to switch it on at idle, i would wait till about 3000rpm before you activate it via full throttle (micro switch). If not, the massive torque jump is what breaks stuff, not increaed wear (as it doesnt occur).....its the torque that kills at low rpm, high rpm teh engine doesnt see too much difference to running off N20.
If you want to run any higher youll need to r****d ignition more and wait longer till you kick it in, but this will ruin off N20 driving. So a progressive controller, although expensive will help you run more advance when off N20.
If i still can get them, wizard kits are about 300-320 quid.
If you can get more buyers i can knock the price down ALOT.
Enjoy, its fun, i have it for little spurts.