There are two types of automobile liquidation: voluntary and compulsory. Boyesen Twin Stage reeds have a big thick base reed with a smaller thinner reed mounted on prime. This setup widens the rpm range the place the reed valve flows greatest. The thin reeds reply to low rpm and low frequency strain pulses. The thick reeds respond to greater-strain pulses and resist fluttering at excessive rpm. A Boyesen RAD valve is completely different than a standard reed valve. Bikes with single rear shocks have off-set carbs. The RAD valve is designed to redistribute the gasoline flow to the crankcases evenly. A RAD valve will give an general enchancment to the facility band. Polini of Italy makes a reed valve called the Supervalve. It options a number of mini sets of reeds positioned vertically instead of horizontally like typical reed valves. These valves are excellent for enduro using due to improved throttle response. In exams on an inertia chassis dyno present the Supervalve to be superior when power shifting. Nevertheless these valves do not generate better peak energy than typical reed valves. Supervalves are imported to America and offered by Moto Italia in Maine.