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Dirt Bike Brands - Other
FMF Silencer for 400/520 EXC
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[QUOTE="jeb, post: 112282, member: 16219"] Yes, those are the specs I currently run. I'm using a 170 main but you may want to play with that. Seems luggers like me like fatter mains where screamers might get more out of the leaner ones. Like you, I didn't want to have YZ4xx type of power. This spec just makes a nice woods powerband into a perfect one. This is the only spec I run and I only run 92 octane pump premium. We don't vary much in elevation here in the upper Midwest so it's not a problem. It seems to have improved the mileage, too. A win-win. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
FMF Silencer for 400/520 EXC
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