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I just did the top end on my 05 450R but I am having a problem starting the bike. I can not kick the bike over, there seems to be to much compression. I've checked and re-checked the valve clearances and decompression clearance three times and they are all within the service manual spec. I ended up bump starting the bike and it seems to run perfect. However, once I stop it I can kick over with normal compression one time after that one kick it goes back to having to much compression to kick over and start up. It seems there is a problem with the decompression mechanism but I'm at a loss for what to look for.

Any suggestions would be appreciated!

Recheck your timing. Off by one tooth will make it hard starting but will run OK.

Thanks for the tip! You were right the timing was off.