NGK Spark Plugs USA
Well you are also right that playing with heat range of spark plugs is not safe...

As per the above link,
- if the engine is to be operated at high RPM, under a heavy load, or at high temperatures for long periods a colder heat range may be needed.
- Conversely, if the engine is to be operated at low speeds or at low temperatures for long periods, a hotter heat range might be needed to prevent fouling.
I just read some where that hero-zma uses CR8EIX..maybe thats because its a 220cc engine so might require to handle more heat...
But what made me think to go for that is, imagine when we are going for long rides & riding at constant high-speeds then colder-range might help us...
Anyway if no trips & for normal commuting then CR7EIX will be more than enough...


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