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    74 merc 850 thunderbolt timing

    1974 85hp good compression fuel and spark......wont even try to fire.........what timing marks on flywheel do you use to install timing belt?
  2. B

    1974 850 merc compression, fuel, spark and wont run

    Any help would be awsome!! I have a 1974 mercury 850 thunderbolt distributor motor. Compression 145# on all 4 cylinders. Rebuilt carbs, replaced fuel pump diaphram, check valves, fuel lines clamps, remote tank with fresh fuel, new timing belt. Good hot battery, good snappy blue spark at plugs...
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