73 Elan 16 HP burning out plugs
What causes a sled to go through spark plugs. Been running the sled now for a month and 2 new plugs are good for about 3 days . Plugs are not fouled still look almost new . Put in 2 more and continue for 3-4 days start all over . I am running NGKs 7BS Started with 8BS NGKs . Any ideas??????