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.
0.85
Spark Plug gap is .025
The correct spark plug gap for the 1994 model, 25 hp Evinrude outboard is .030 in.
The 25 hp Johnson outboard runs a plug gap of .030 in.
its gaped at .25
.25
gap is .025
look under the cowling, my merc. 25 tiller gap is .40
25-.30
According to weedeater.com they are all to be .25..
25 thousands of an inch
on most trimmers the gap is about 25 thousands !!