1975 CB 750 HONDA SPARK PLUGS?

THE BIKE CALLS FOR NGK PLUG HEAT RANGE OF 8
I WAS HAVING TROUBLE FOULING A PLUG THE CYLINDER CLOSEST TO SHIFTER
WENT TO BUY NEW PLUGS THE GUY SOLD ME NGK HEAT RANGE 7
THIS IS A HOTER PLUG. I DID MY RESEARCH AT NGK SITE
THE BIE RUNS FINE AGAIN HAPPY////
QUESTION WILL THIS PLUG RANGE HURT MY BIKE NJK STATES IT RUNS 75 DEGREE HOTTER I REALLY DONT RUN BIKE HARD
 
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