I don't know about the K1 models but the later K3-K6 models have a PAIR emissions system. It injects air into the exhaust manifold to burn up any unburned hydrocarbons in the exhaust. That can cause a pop when you close the throttle.
Well Scootereno. You were spot on. The backfire started to get worse...so it was out with the air filter. Man that thing was black with muck and grime. Cleaned up and dried out and put back in. Sweet...no backfire. Simple things can make so much change.
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