I liked the EPI yellow for compound helix's in 440 thru 600 single piped sleds. The Polaris blue 25/55 or HSP orange 30/70 might be a little more forgiving for the 400. If you use a performance helix it may be cut deeper under snap ring for overdrive applications, if so add two more 30 thou spacers under snap ring if you use stock belt.
i see i guess who ever did took the clutch apart before me was not that good cause there was no shim under the clip. and should i have a shim on the back of my helix after the clip because my problem was that my clutch had to much play and sometimes would move over and grind against the chassis
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