It might be useful if you could provide some basic data about your engine, such as bore, stroke, rod length, is it piston port, reed or disc-valve induction how many transfer ports, and gears, 3-4-5-6 and so on? What is the intended use, is this a race engine, sprinter, fast road etc. The more information you can provide will ensure a more accurate and appropriate reply.
There is little point in trying to tune an engine with an exhaust port timing of a balls out racer having transfer timings of a sport roadster and inlet timing of a commuter bike! I`m sure you get the picture, all the best with your project.
cheers, Mel
Aujourd'hui à 0:25 par 
