What is that buzzing sound @ 2800 – 3000 rpm ?
The buzz comes up at about 2800 revs, where the engine shakes at such a rate that the plastic engine cover plate starts resonating against the camshaft cover underneath it. A simple fix can be found here. [gc] Some find it to be a pretty reliable non-visual reminder that you are travelling at 20 km/h in 1st, 40 in 2nd, 60 /80 etc. Vastly more drivers seem to be annoyed by it.