I dont have powervalve problems I dont think but my CDI (PGM in later models ) burnt out a few days ago. Fit another one that cost about 60 GBP and still have problems with my lower spark plug quickly fouling. Im wondering if the CDI burnout is related to this or if it was coincidental... Still dont know what the root cause is, but maybe my piston rings are buiggered after all that
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'87 MC16