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FWIW I read somewhere that the torque figures for drain bolts on these Yamaha and Honda chinaclone engines (usually taken from the original manuals) are actually considered quite high and damaging even for the original engines (e.g. the TW200's 20-30 Nm spec, which in my experience is actually way a bit too much on the tight side). Maybe it pays to ease a bit back on the torque, esp. with aftermarket plugs.
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