Hi,Just bought a 2001 Suzuki gs500 and I think the carbs are out of balance. When idling, the bike backfires (I know this because the carbs are being pushed out a wee bit and there is power loss when it happens). Wondering if it is possible to balance them out myself (if so, how is it done?)or if I have to contact a mechanic. I am a mechanical engineer and have a fair knowledge of bikes as I have done a rebuild before. Hope to hear from you soon, Cheers, Dave