Why is my new headset stiff?

I have installed a new headset to my hardtail, its a sealed threadless Aheadset. I have installed it as per the several guides I read up on. Greased the cups etc. I did however use a mallet and screwdriver to install the race crown but it seems a good job to me. It is just pretty stiff and I get resistent when I try to turn it. If I loosen off the bolt at the top it gets a bit better but still stiff. Can anyone help pretty please :oops:
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There is no secret ingredient - Kung Fu Panda
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Parktools :?:SheldonBrown
VOODOO CANZO
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There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
Yes I have had a read through it. Makes things much clearer. I have a Truative stem with a single stem bolt on it. Judging by what I have read I will dissemble everything when I come to do it next and make sure every component is seated correctly.