This engine is fast, Voodoo Magic is running 1 .... The difference between the NSR & L3 was only 1 part which is the sleeve , just a little higher port timing... The rest are exactly desame naming Piston, head , crankcase, crankshaft, carb , Bearings, etch... So you can convert your NS or NSR series to L3 by just replacing the sleeve and piston when you wear them out ...