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  1. Q

    idle speed

    hello everyone,<br /><br />i rebuilt the carbs on my 1971 mercury 650 w/ thunderbolt ignition... i have the idle speed screws on the carbs adjusted to where the engine is firing good and the boat runs good....but the idle speed is way too high.... it says in the book at this point to adjust the...
  2. Q

    1971 mercury 650

    I have just put a new engine on my boat (1971 mercury 650 w/ thunderbolt ignition) I rebuilt the carbs on this engine before installing.... my question is about the 2 main cables that connect the throttle and gas lever from the ignition. I was able to adjust the main throttle so that the gears...
  3. Q

    can't get spark

    i have 2 engines one is a 1970 mercury 650 w/ a bad piston...but good spark.. the other is a 1971 mercury 650 the compression is fine and the plan was to swap electronic parts til i got spark.. i changed the distributor and the switch box but still am not getting any spark...a friend was able to...
  4. Q

    spark plug wires

    im wanting to replace the spark plugs on a 1971 mercury 650. I was wondering do i have to use the marine (expensive ones) or can I just go to an auto parts store, buy a kit, and cut them myself????<br /><br />boatyboat
  5. Q

    should this part work??

    i have located an internal wire harness on the shad connection for my 1971 mercury outboard 650 w/ thunderbolt ignition serial # 3073788. i was told the part number for this was 52771A2. the part i found is made by CDI electronics and it says it replaces 52771, im assuming this part will work...
  6. Q

    1970 mercury 650 cleaning carbs

    i want to rebuild the carbs in my engine- 1970 mercury 650 w/ thunderbolt ignition serial# 3073788 i was wondering if it is possible to get kit for these carbs?? if possible how much does this ussually run??and any recomendations on where to get it. if not possible are there any other...
  7. Q

    1970 mercury 65 HP 4 cyl-bad piston

    ive just recently picked up my boat from the shop and the compression checked out to be 136, 139, 106, 133... #3 piston is burnt on exhaust side, spark is fine. i am going to put a new engine on this boat and was wondering if it would be dangerous to run this engine into the grave?? or if...
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