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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
PW80 tire choices
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[QUOTE="Body Cast, post: 771885, member: 53693"] [b]Fatty pipe vs original[/b] The biggest difference in construction of the FMF Fatty pipe and the stock unit was the stock one has a welded restrictor for about an inch in the cylinder end of the pipe. It was about 1/2 inch in diameter compared to the full 3/4 or so on the fatty. The square boxy end before the spark arrestor on the stock pipe was absent on the fatty as well, but I think that just contained packing to keep noise levels down. I was really suprised to find the other external dimensions of the Fatty to be identical to the stocker. I have read on this site where people have either die-grinded or large-drill-in-drill-pressed this restriction out and had good success. It wouldn't supprise me if they had basically the same results for free. But then again, it still isnt shiny nickle plated :) . I have read post here too where some have modified there stock arrester for better flow but if you cut off some of the pipe in that make sure you make straight cuts or you can get a whistle (so I have heard). [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
PW80 tire choices
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