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Take the time to dismantle the brakes and clean the inside of the drums with sandpaper. You can also lightly scuff the shoes, but wear a dust mask when you do. Clean everything with Brake Clean. Lubricate the pivot points with a little grease; I use moly for that.
When you reassemble the brakes, ensure that the square block on the spindle is inserted into the square hole in the drum backing plate.
Get a can of Maxima Chain Wax and a cable luber. Lube the cables liberally, and then reassemble and adjust.
You'll still have awkward front drum brakes, but they'll be optimized. We have four quads like that in our group, and I've been through it before.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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