The TVS mech is very sure that the gear box is the culprit... during the 2.5 hour test run he changed the carb tuning a number of times and tried all possible tunings so that he can cross 105kmph... but that was just not happening... he was adament that its carb tuning problem only but when all those tunings didnt work out he concluded that its the gear box... he also said that two 160 FI bikes had this problem previously in a very severe manner...
below are some of the spark plug pics which i took yesterday... you can see some more pics a few pages back... sorry again for the poor pic quality but the best cam i have atm is a 3 mp phone cam...




(If indeed the guy HAD replaced your spark plug)

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