You probably won't feel much pressure at cranking speeds, as the bike raises an exhaust valve a bit to aid starting. Same reason it is difficult to get accurate compression readings unless you disable the automatic compression release.
I had a similar experience when I burnt some valves on the road. I would check valve clearances and if you find some with none, that could be an indicator.
Probably not the case, but if you find some valves with excessive clearance, that is a sign of bent valves.
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itsatdm screwed with this post 10-29-2012 at 02:18 PM