February 9, 201610 yr Hey guys, My beta 2008 beta Rev 3 270cc has started making quite a loud knocking noise from the engine it's sounds like it's coming from the top end. Also when I've removed to spark plug it has a black, wet (sort of oily) residue on the plug I don't know if this has anything to do with the noise but I know the spark plug shouldn't look like that. Anybody got an idea what the problem(s) are? Thank you in advance Jordan
February 9, 201610 yr Very difficult to diagnose over the internet. Could be a number of things, from pre ignition thru to piston or small end
February 9, 201610 yr Author What would you suggest? Take it to my local trials bike shop and get them to have a look?
February 9, 201610 yr Yep, certainly if you do not feel comfortable mechanically investigating yourself.
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