I use this on a yoshimura RS-5 on my 2013 CBR600RR. Fit is absolutely perfect no need for force it in, one of the ribs is sized perfectly for this exhaust. It is a soft rubber compound so it grips and stays in there very well. Deffinately a must have for the RS-5
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I bought this product because of the advertised 4 stroke compatability. Well made bung however it's too large for my ktm 350. When installed it only allows 2 rungs to enter the muffler making it heavy on the back end and it falls out. Disappointed purchase.
Great buy on the Bung 4 plug. It fits very tight keeping all water out during washing. Used it about 10 times and still feels very durable. Love the Yamaha Blue color looks great as well.
There have been no questions asked about the Oxford Bung 4 Muffler Plug.