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Ah ok... The only reason I can think of for the sprocket to bind during rotation is that the crank is off TDC or 180* out and a valve is hitting a piston. It doesn't take much to bend a valve and it is possible that has occurred. There will be some resistance while you rotate the cam because it has to push open valves while you rotate it but it shouldn't bind. you need to align the mark on the crank sprocket with the mark on the block so it is at TDC and then rotate your cams clockwise till the marks on the sprockets line up with the marks on the cover. Then when you install the belt you simply line the marks on the belt with the marks on all the sprockets as outlined above... Also for good measure I found this write-up which is similar to your motor. http://lovehorsepower.com/joomla/ind...d=48&Itemid=64
Once the motor is together a compression test will reveal whether you have a bent valve or not. Beyond that you may want to check your plugs that they are not fouled and verify the gap.
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