Same problem on my bike and it certainly isn't chain lube as I haven't put any on since i bought the bike. I also have the same black crap leaking down my gear pedal and onto the pot
which means it must be coming from the sprocket area. On the upside, my chain is always lubed! Was told by a local mechanic it may be a defective oil seal behind the sprocket, leaking engine oil. As for it's colour, mine is jet black too, a tad worrying if it's engine oil! I've been keeping an eye on the oil level through the window...all good, but a leak this small would not be immediately visible through the window as we're talking in milliliters from the 1.6 L engine capacity.
Yackadus, do keep us informed whether you've solved the problem by changing part "9". BTW, the part "10" appears to be part of the gasket-set, so they may both be important in preventing oil from coming out the engine!
Bajadog, do you reckon a loose nut "13" on your exploded diagram could be causing such a leak?
Cheers,
Reshad
The lock washer (pt.2) had not been folded over, and it seems the previous owner used no Loctite either! If you look at Anzhsb's exploded diagram, you'll see the O-ring must very be tight (60Nm) probably against the roller bearing (pt.7) to make a perfect seal. Either it's that or the O-ring or oil seal is knackered. Anyway, I'm gonna cleanup the whole area tomorrow morning and get that nut torqued to 60 with a dose of Loctite then properly fold the lock washer to avoid any future loosening. Hopefully that'll cures my nasty drip!
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