this bike has a freshly broken in kit, ran awesome until suddenly it began violently four stroking and will only go 15 mph
stuff i checked out:
carb- perfectly functional 15 bing with a 90 jet, swapped on a 12 bing with same results.
pipe - estoril
electronics - near fully advanced timing with perfect beautiful blue spark, brand new condenser, adjusted points in both directions with no improvement.
downjetting drastically improves 4 stroking slightly and gets up to 20 mph. not the solution..
any suggestions? faulty reeds?