Knife edging is no change of timing, the moment of opening and closing will be the same.

I do not think crank and poortiming are that much related to each other, I have messured a lot of engines and have seen a lot of combinations with timing. The funny Thing with most Novarossi (based) engines is that the intake is always @65 degrees (130 in total opening)

On most onroad engines I always do add 2 or 3 degrees at the closing moment of the crankshaft and making the exhaust a little bit wider and higher (0,2mm).

A simple calculation:

- Krankshaft 14mm
- 1 full turn (360 degrees) is 14 x PI = 43.98mm
- 1 degree = 43.98/360 = 0.122mm

A stock Novarossi 14mm crankshaft is 10mm in diameter messured on the crank opening.
When grinding one side and messuring on the crank opening you must think in half the size so taking away 0.122mm at one side is making 9.939mm messured on the crank opening you have changed it almost 1 degree.

In the drawing you can see the explenation why thinking half the size

And if you want to do more with engines you make a tool to messure timings.
http://www.modelbouwforum.nl/forums/...-en-tunen.html