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  1. R

    timing setting

    I have a 75 merc 650 that I just bought. I had to change the timing belt and would like to know the correct way to set the timing. The decal calls for 23 degrees btdc. My timing light shows about 10 degrees at idle. Is the 23 degrees supposed to be at ilde or full advance. I have not got my...
  2. R

    engine timing

    on a '75 merc 650 65 hp at what engine speed do I set the timing it has thunderbolt ign. Do I set it at the spark advance screw? The timing specs is 23 btc. thanks
  3. R

    tach wiring

    can anyone tell me where on a 75 merc 650 65 hp to hook up the tach lead? the original control assembly is missing, but do have original wiring harness. What color wire in the harness goes to the pul terminal on the tach? Also, what pulse setting for a three cyl enginge? Thanks
  4. R

    hooking up a tach

    on a 1975 mercury 650 65 hp where do I hook up the tach pul lead. Do not have original controls so cannot hook uo to the control plug. Do have original wiring harness
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