I replaced the fibers on my 03 450 with Moose plates. The Moose plates fit pretty good, and measure real real close to stock, but some didn't just drop in. I decided to file and smooth the fingers on the clutch basket. The stock plates were hard to remove even with two homemade little hooks. Result after 45 minutes of filing, no clutch drag after warm up with Rotella 5w50 syn.
I had a strange thing happen after the install. The clutch worked fine untill the engine was running, then no clutch. The lever would have no resistance. Kill the engine, the clutch came back. Turned out there is a very light weight spring behind the piston in the slave unit. It dosen't show the spring in the exploded view of the slave unit. Sandman on this site, after talking with many dealers, was the one who suggested that was the problem. The spring was so weak on the 04 and older bikes, the pressure of the engine oil would effect the movement??? I got a heavier spring from gofasters and problem sloved.
It is a much heavier spring.
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04EC300
04Wild450
07FSR450
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