either the carbs need cleaning , crank seal
when I take the plug out hte plug has weak spark and fires intermitantly
No carb or seal can do that.
Loose connections in ignition circuit or bad battery/charging. The NSR is very sensible to battery voltage, maybe its just charging that little amount more, when above 3000rpm.
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Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom