My Armstrong CMT310 with the Hiro 323cc engine starts pinging about 30 minutes into a ride. I am running premium fuel with an octane booster and an NGK BP6ES plug. The ignition is a Kokusan CDI, can the timing be adjusted with this ignition? All I can find in the hand book is to center the screws in the slots on the stator backing plate. Anyone have any ideas to try? I have a spare CDI unit and have swapped out the original but stil have the same problem.
Rick