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Ours had a similar sound. I thought for sure it was either the air pump actuating under load or something in the motor. It only showed up sometimes, under certain rpm's and loads.
Ended up being the right side tank plastic wing that I discovered completely by accident.
The rear clip-on mount needed to be bent in a little to hold the wing tighter. Tap on both plastic wings toward the rear and see if you can replicate the noise.
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2007 Suzuki DRZ400S (SM convert)
2009 Q Link XP 200
1967 BSA B25 250cc Starfire
2022 Royal Enfield Interceptor 650
2023 Royal Enfield Scram 411
1948 Royal Enfield Model G 350
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