crf450 cam chain, necessary?

[bodfper]

I am building a 406ex with a wiseco 11:1 compression with a stg 2 hotcam. It looks difficult to change the cam chain and I am wondering if it is necessary to change the stock cam chain to a crf450 cam chain. If I do not do it what will I lose? Whats the reason for going to an HD cam chain.

Another thing is valves. I was going to buy kibblewhite valve springs because Im going high compression. Should I replace the valves and the valve springs or do I not need to replace either. Is it dumb to just do the valve springs? THANKS

[togup]

if they are worn out yes change them but with what your building it isnt necessary .

[Wheelie]

The cam chain is cheap insurance.

If your valves are in good shape, no need to replace them. Stock 400ex valves are pretty stout pieces.

[VTredneckgames]

cam chains do wear out over time. At some point or another it will stretch and start slapping the inside of the case. Mine had already started when I tore mine down to rebuild it. That particular chain is heavier duty and only $28. It took an extra 20 minutes for me to install when I had it tore apart. Its just an easy time to do it.

[MarvOhio]

New Here, will any year crf450 cam chain fit?

Thanks
Nick

[mineralgrey01gt]

I went with an 02 cam chain, but i think it was 02-08 works or 99-08 something like that.