hey Bros,
Just came back from a run-in of my Mach 21 engine..Got a query to ask:
Noticed that after a tank of nitro, realised that my engine will often emit a loud pitch sound, sounds like a high idling sound, it's tends to goes back to normal idling sounds a few seconds after a complete stop of the buggy..
Is this normal? if not what could be the problem.
Pls advise and thanks in advance.
