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Hey guys,
I’m just about to give my Monster 1200 it’s annual/15,000km service and I noticed in the schedule it calls for spark plug replacement. Is this necessary every 15k? It seems excessive these days, compared to bikes and cars I’ve had in the past. I don’t mind doing it if need be, but just wanted to get some other people’s experiences.
 

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With replacement items like spark plugs, the maintenance schedule is estimating usable life and assuming you want peak performance. If your plugs look fine , re-gap them and install them again if that’s what you want to do. You can always change them when mileage suffers, or it becomes hard to start, or it doesn’t run well.
Definitely remove them and at least examine and re-gap them, though, so they don’t seize in the head.
 
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