I've put just under 1,000 miles on the 03 1K in the last 2 weeks and I notice a very distinct intake "pop" as if it is pre-igniting while the intake valve is still open. This is a smooth running engine that makes great power and can be run at 2500 RPM with no chugging or shaking. The throttle boddies are recently synced and it has the DynoJet USB electronic tuner under the seat and was dyno tuned by the original owner. 14,900 miles on the bike, all records indicate excessive/compulsive maintenance routines from both previous owners. Bike also has recently installed KN intake filter with around 1500 miles on since installing new. Also has aftermarket StainTune exhaust, the sound has been observed both with the sound baffles installed and without.
This is not something that happens regularly, it is totally random and in a 200 mile day will be heard maybe 2-3 times. Always while lifting the throttle and pulling the clutch to shift up or down, I have not experianced it while cruising on throttle.
My fear is that it may push the throttle body rubber boot(s) off as I have read many times on here of the boots becoming part way dislodged.
Is this a normal thing to hear every once in a while, or should I start to panic and tear apart the bike?