Blaster over revs badly while driving but basically no power

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It could be a great idea to start a specific thread to talk about WD40 to save cluttering up this thread.

Edit: WD40 thread started in Off topic!
 
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did you adjust the clutch correctly?? This is a great tutorial about installing the blaster clutch from the man Ken. at about 14:13 in the video he shows the adjustments of the clutch. that may be your problem.
 
A plug coming out black after a period of idle is pretty normal.

A sure fire way to test for correct jetting is to plug chop!
 
Shouldnt the plug come out almost golden brown and whole bike is stock except for the clutch