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What's the foam stuff you use to stop mud build up between the frame and the sump guard?

Where can you buy it???

I need some more...!
 

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I've got a pile of the stuff. Make me an offer?
 

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Technical name is reticulated foam but yeah filter foam, baffle foam, think I've seen it called quick dry foam as well. Used in loads of stuff. We've got a boat with cushions made from the stuff.
 

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I think Rob Andrews (80s 500GP MX rider) pioneered this, at the time they used fuel cell foam and reported the bike was about 20kg lighter after a muddy 40-minute + 2 lap moto compared to not using foam. Looks like you can buy it in cubes and just cut to fit, might get some myself for the chalk downland cake mix:

 

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Cheaper if you get the aquatic filter foam. Same stuff, just not price loaded because it is for a bike.
 
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