Rear Mech trouble

Hi
Trying to fit a new SRAM X9 9 speed mech. However, it won't go up to the highest gear (lowest sprocket) even without the cable attached. The High adjuster screw is all the way out and it still only manages to get to get to the second smallest sprocket!!!
This is a very annoying, stupid problem. Anyone got any ideas or had this before?
Many Thanks
Trying to fit a new SRAM X9 9 speed mech. However, it won't go up to the highest gear (lowest sprocket) even without the cable attached. The High adjuster screw is all the way out and it still only manages to get to get to the second smallest sprocket!!!
This is a very annoying, stupid problem. Anyone got any ideas or had this before?
Many Thanks
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Posts
Checked that it is not fouling on anything.
6mm clearance for the mech?
Parktools :?:SheldonBrown