If you're adv is fitted with the "secondary air system" and it has developed a leak it result in loud bangs when you come off the gas.
Check if there is a small pipe coming out from between the exhaust headers on the front of the engine (it's about 8 mm in diameter). If you do then you have an SAS fitted (is standard esp for bikes supplied in Germany). You can buy a little aliminium blocker which fits in under the header pipes. You can then remove the whole sas system an file it in the bin. Normally the sas leads to a breather on you airbox on the other side of it so if you remove make sure that the airbox is properly sealed.
Cheers
Nick
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