crm 250 mk2 seem to have a very weak spark and seems a little irregular replaced plug (b9egv) still wont fire even after squrting a little wd
40 into cylinder

Clean all the shi#e of every connector you can find ,,,Replace the plug cap , Double make shure you have the right gap, Clean out the kill switch and check the sidestand switch been hotwired ok,clean connections,Make shure you have a very good earth and your rectifiers clean and earthed too....Easystart for car carbs works better than wd40..Just spray a little in your airfilter box.. ,hope this helps ,, There are lots of posts on this weak spark topic elsewhere