the oil leak you have from the left side will be the gear lever shaft seal or the final drive shaft seal these can both be pulled out from the engine easily with a hook shaped bit of metal or a pick or seal puller and new ones can be pressed in.but this will not cause the plug to oil up,it sounds like its the right hand crank seal that is leaking as i said before its inside the cover on the right hand side of the engine behind the gear on the end of the crankshaft but its quite a big job for someone who hasnt done it before if you know what i mean i have done hundreds but i do it for a living but i dont know you abilities to do it are you able to get acces to an air impact gun as you will need this to take the nut of the crankshaft and maybe a new gasket for the clutch cover if it breaks ok hope this helps more mate tc adam.ps also the shaft will have a bit of play in it but try to take the spacer of behind the sprocket and turn it around providing there is not a recess in it for an o ring if there is just fit a new seal and o ring which will stop the leak.
adam bike doctor
March 2006
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