Are you using complex engine management?I believe there is a bug in the non cem model making it slow.
If using cem,one small tip,presumably you're rad is are open,if not,it should be,but and it's a big but,you must ensure it's not fully open,as the drag with it being fully open totally kills you're speed,almost the same as an airbrake being applied.
To answer you're question,yes I have had my Mk1a well over 250mph.
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Alienware Aurora|Win 7 64-bit Home Premium|IC i7-920 Processor (Quad-Core)|14GB DDR3 RAM|1 TB SATA 7200rpm Hard Drive|GIGABYTE GeForce GTX 770 2GB WINDFORCE 3 X fan|Thrustmaster Warthog|Saitek Pro Combat rudder pedals,throttle quadrant and Cessna trim wheel|TrackIR4|Sense of humour,I find it comes in handy!
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