Need help Urgently Have a Honda VFR400
grey import hade it for 1 year & it went in for a service after geting it back the bike was not the same. The air filter they put on melted into my carb & the carb was damadged. I then got a second hand carb & fitted it with no luck the bike has no power so i then read about how to check for valve clearance Major problem did the hole valve clearance from begining to end started the bike & it was 80 % beter then before. Did not ride the bike till the other day & there was a funny Tapping Shuttering sound coming from Cylinder 3 It is a bad sound & i dont know what to look for a what it can be. I dont want to drive her like this & then the Engin blows or something like that If someone can just give me some pointers to check I will appreciate it thank you 
