The sound you hear is from the auto decompression valve. Accelerate gradually and if you hear that sound again, just downshift.
The mileage you get is excellent and if you like keep the bike in the same good condition, avoid all unnecessary repairing.
Knowing the correct valve clearance will surely lead you again to that insane local mechanic who said there is no decompression valve in any other bike than GS; I am sure. Keep away from such morons who spoil the bike.



until I saw your fantastic work did on it
..




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