Quote:
Originally Posted by flarex
If you re-use the spark plug seals oil may leak into the spark plug area. You want all of your seals to compress equally. the old ones are compressed and tend to leak if you don't replace them at the same time.
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My twin has the little "half moon" rubber end plugs on the ends of the camshafts that mate with the valve cover and leak oil when they get old. Set of four plugs runs about $70 at the dealer.