Does anybody have any experience of restricting 50cc 2 strokes to suit their local laws? I'm going to have to get an engine with a genuine 2.5bhp down to 1.3 to get through the approval process, and although I think I know how to do it, I wonder if it will be enough. Step 1 is to find the smallest carb in the shop and fit that. Step 2 is to introduce a positive stop to the twistgrip so it can't open the carb much anyway. Step 3 is restricting the exhaust outlet, with the option of reducing the "inlet" side of the silencer. Step 4. Use Super Unleaded for it's slow burning properties. Anybody got any more ideas?