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The most common spark plug gap for the rover 25 is 0.85mm, so it would be safe to assume that yours should be gapped to 0.85mm. You should refer to your owner's manual or call your local dealer to find out if it is the correct gap for your specific year model and engine size, but if you are unable to locate a dealer or manual, 0.85mm would be your best bet. If you gap it and your car is running rough or if anything seems wrong, then there is a problem with the gap and you should have a professional look at it.

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15y ago

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