but i cant throttle up pass 50 % throttle do anyone know how to fix it?
How do you know the throttle is at 50%?
The value seems odd, because the way the Shuttle works the lowest throttle setting you can achieve is 67% - even with lever all the way down you can't go lower than that.
Also, by default the Shuttle is on autothrottle, so you shouldn't be able to throttle the engines at all.
So where do the 50% come from, and what are you trying to do for ignition?