Join Date: May 2014
Location: Gabriola Island BC
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The 450 Kawasaki dirt bike from the 70s did the same thing. Blocking the intake would stop them.
If it is carbon build up, I suggest you remove the head and clean the combustion chamber, which includes the top of the piston. It could also be running too rich, fuel, or too rich with oil. Or the oil is not of good quality.
However, most engine runaways are due to an air leak on the intake side.
You probably have an oil pump on that model. From memory I think they are adjustable.