So here's a pic of the plug on dirt bike. It's a cheap and nasty 200cc Honda XR200 clone. I fitted a 30mm carb and have been fiddling with the jetting to get it right. At the moment I'm running a #100 main and the needle raised 1 notch off centre. The bike idles really well and pulls well through the mid range, it is just a bit rubbish at the top. The plug has hard white deposits on the strap and about half way round the end which would indicate a lean mixture. I just thought I'd post it up to see what other peoples opinion is... This is not a picture from a proper plug chop, it's basically after a ride around at full - 3/4 throttle for half an hour with a new plug.