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My '68' parts book calls for a paper air filter element in the TR6R & C but cloth in the T120's. I'm wondering why. Which provides the best filtration? Which provided the best flow? Would engine longevity be improved for the T120R by switching to paper? The TR6C is a competition bike often rode in the dirt so the max filtration thing would be an issue but the TR6R and T120R are street bikes and use different elements.
 

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Hi Jimmy, I think you will find you have answered your own question. The competition TR would require far more regular changes and a paper one works well and is cheap to replace. The cloth T120 would work fine as well. If you are looking for a street use machine stick with the cloth unless anyone else has experience? The only other comment is to monitor your plug colour regardless of what type you choose as the 2 different materials may effect the combustion.
 
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