it isn't totally neccessary to disasemble your engine, just as long as you take good care of it. my recommendations are;
-run a new airfilter every race meet,
-use afterrun after every race meet
-use top quality degummed oil and synthetics
disasemble the motor just to see if everything is "OK" before break in, after break in and every 8 litres or so of fuel.
done.
