Have not been able to identify the problem Im afraid...
Still got to check those engine mounts closer, but I did have an an inspection and they looked good.
Still waiting for sprockets, chain and clutch plates to arrive. I have the sinking feeling though, thats not it.
Watched a video of a RMZ250 engine teardown and overhaull.. yikes! I would love to do that one day... but don't have the tools or the time ATM.
I also looked at general engine trouble... a close resemblance to my issues seems to be the crankshaft bearings... I really hope not.
Thing is that I don't see any worthy workshop up to the task of a full engine overhaul over here, not to mention the price tag!!!
Any other ideas? idles fine, no trouble starting, no perceivable loss in power.