ORIGINAL: Jburry
The stated maximum rpm's are given as a guideline. You can expect that the engine will not come appart immediately up to that speed. Much like the redline on your car, you don't aim to achieve it (often).
J
Pretty much all of these size two strokes will have no problems running up around 15K, it is actually easier on the engine than lugging it down at 10K. You cannot compare to a car engine they are not designed to run full throttle all the time like a aircraft engine.
The supertigres are good engines and will last a long time.