You can take the answer as yes...IMHO. There will always be tell tale sign that a plug is about to go..like running on three cyclinder instead of four. Hardly is a case that a bike can't start because of bad plugs..which normally its too wet and this has to do with the carbs. If a plug don't fire well..it has to be the spark plug cable or the step-up coil. If you are the enconormical type..you can even take out the plug once a year..have it clean and the electrode bend to correct gauge gap and reuse...unless, the electrode and core are worn out of form.
When I first used my standard NGK for the PB1...it was a long lasting two years over...no problem...performance and all as usual and I don't ride gentle. I change to iridium when it came out because the specification shows that it's tougher and stronger and provide better sparking due to its thing tips...still using theml date.
we have to understand that the plug is only managing a 100 cc engine for each and it can handle better for today engine design has come a long way.
Again...opinion may differ..and I do know of ppl changing plugs every three months or every tthree oil change....sighhh.



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