NGK vs Bosch Spark Plugs: Which is Right for Your Engine? 

Using NGK CPR 8 EA-9 spark plugs in a 125cc Honda Shine bike instead of CPR 7 EA-9 may not be ideal, and it can have an impact on the bike's performance. Spark plugs are specifically designed to work with certain engines and their requirements, and the difference in heat range between these two spark plugs could affect combustion and engine efficiency. In this case, CPR 7 EA-9 is likely the recommended spark plug for your Honda Shine 125cc, and it's usually best to stick with the manufacturer's recommendations. Using a spark plug with a different heat range (in this case, a higher number) could potentially lead to issues like poor combustion, overheating, or decreased fuel efficiency. To ensure the best performance and longevity for your bike, it's advisable to use the recommended spark plug or consult with a mechanic or your bike's manufacturer for guidance on the best spark plug for your specific model and riding conditions.

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Sir, minimum how much kilometer continuous drive should we make so as the spark plug reaches at its self cleaning temperature( in our usual 125 or 150 cc bikes ) ?

Motorcrap plugs are extremely poor made! it made my car run rough and very sluggish. The best spark plugs are the Beru spark plugs.

Bosch spark plugs cause misfires in Fords,I have seen it before