I think most are around 140psi. Someone else who knows for sure will chime in soon. That's the way to be positive about a possible bent valve. If your valves are properly lashed and your compression is low odds are there is valve damage.Does it smoke bad or did you notice excess oil on the plug when you changed it? This could be a sign of bad rings which also causes lose of compression. If none of that then the cam timing could have skipped a tooth. In any case its best not to run it more than needed to diagnose until you figure it out as the possibility for greater damage is pretty high. If you have to tear it down you could go ahead and get a port and polish done on the head....BIG difference to power.
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MXR TrailBender 160R
SYC Perf head P&P,Matched intake and exhaust, A12 cam, Orange CDI & coil, Motorio pulley, 115mm Variator and lightweight drive face,11gm Sliders, UNI, modded muffler + 200 horsepower 
http://www.youtube.com/watch?v=3hx-hEWl10c
I'll take your insults as compliments and blame it on your lack of intelligence.
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