The MT-90 and MTL is a GL-4 spec thats way we use them. And you might want to check and see if the flywheel is loose, thats what it sounds like. Or a spring broke out from the hub of the disk, that happens everynow and then with NAPA disks, but its an ACT disk so I dont know.
~John
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Moon taxi: 9.45@156.9 mph 41psi 2011... Letting people down sense 2012.
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