Jim, if you don't want to buy flat packing and wrap it round, you can get packing for RS250 that comes already to shape that slides over the inner baffle, search on flea bay under Honda RS250, there are a few on their, or google RMD motors, Rick Degens, based in USA and Japan.
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Proud Father of , 05 ktm 400exc supermoto 2018 honda crf rx supermoto