For what it's worth, I fixed the problem myself. I drilled a small 1.5mm (just under 1/16") hole in the top of the piston to about 3 mm (around 1/8") deep and screwed in a small self tapping screw and pulled the piston out. There didn't appear to be any reason for it sticking, but i polished it with fine wet/dry sandpaper anyway. It seems to be working fine now.
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87 DR200, re-jetted carb, drilled airbox, big rear sprocket
84 TS 185 - will kick any 250
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