Cam Turning Hard

I got a '04 YZ 450 and after rebuild the exhaust cam was turning hard. The intake cam is fine. I used the proper tightning sequence. I had it so it turning like its supposed to but after I ran it through the first heat cycle I tore it apart again to check that it still turned good but it was turning real hard again. Any suggestion on what I did wrong? Thanks

Check the cam clearance with Plasti-Gage as shown in the manual. It's not that unusual for the cams to seem a bit tight when the engine is cold.

thanks, I'll try that.

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