in the US many ask about "pinging" (also called pre-ignition). A slightly loose chain at lower RPM's can sound much like the same and is the cause of many of the complaints. Check your chain tension before you do anything too time consuming 
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jeff
'00 XC250 (mine)
LTS front and rear suspension, power valve cover, carb jet kit and rear chain glide, RB Designs head mod, BRP tall triple clamp, backyard foot-peg lowering conversion.
'04 EC250 (the kids)
(he can do his own mods haha!)
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