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Originally Posted by GZ250
I change spark plug each year, no matter what the health of spark plug is. Earlier than that can't say would make a differance. And for air filter every two years. It also depends how much you run. I commute every day.
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i dont see a point in that.. if it's not broken don't fix it. spark plugs can last for a long time. if it looks bad when you take it out than fix it, if it is in good shape just check the gap and make sure it is correct if you got it used, who knows what the last guy did when they had it.