Search results

  1. P

    1973 Mercury 40 4hp: Compression, Spark, Fuel - No Start

    Hello everyone. me again. I decided to take the point out and review it. I know next to nothing about points - but I suspect that this has something to do with my issue. Looks like it fused together at one point and broke apart unevenly? The gap previous to this was maybe a hair larger than .2...
  2. P

    1973 Mercury 40 4hp: Compression, Spark, Fuel - No Start

    I have a multi meter that I got free/came with a purchase from harbor freight and I'm not totally sure on how to use it. Is there a way I can test my existing condenser to see functionality?
  3. P

    1973 Mercury 40 4hp: Compression, Spark, Fuel - No Start

    Just ordered that spark plug, should have it tomorrow. Previously I scraped out some crud from the point and attempted to scuff the contacts with some fine sandpaper. It didn't seem to make a difference. What should this be gapped to? I didn't take anything apart, just used a pick to get the...
  4. P

    1973 Mercury 40 4hp: Compression, Spark, Fuel - No Start

    Thanks JDusza- Serial Number 3657668 What currently existing perma-gap champion sparkplug would you suggest? I'll test with the premix/oil as suggested
  5. P

    1973 Mercury 40 4hp: Compression, Spark, Fuel - No Start

    Following up to this thread - would LOVE some insights from you pros out there that know about the thunderbolt ignition system and what I could test to continue troubleshooting. I have spark, but not enough. As racerone helped me learn, I can definitely not spanning enough gap when NOT under...
  6. P

    1973 Mercury 40 4hp: Compression, Spark, Fuel - No Start

    Well I guess that's the next place to start troubleshooting! I'm about to take off for the weekend and will be away from the motor but I'll still have access to reading this forum and completing research. Would love any insight on diagnosing/repairing or straight up replacing the ignition coil...
  7. P

    1973 Mercury 40 4hp: Compression, Spark, Fuel - No Start

    I live a few miles from a parts place so I just picked up a cheap ignition spark tester. Longest I could get the spark to span was about 1/8" - so does that mean too low of spark to get combustion?
  8. P

    1973 Mercury 40 4hp: Compression, Spark, Fuel - No Start

    I’m leaning toward ‘no’ with the caveat that with the perma-gap plugs I can’t really tell. I “tested” by placing the plug, in the boot, against the cylinder block and turning the flywheel to visually see a spark. I don’t have one of those spanning test devices.
  9. P

    1973 Mercury 40 4hp: Compression, Spark, Fuel - No Start

    Hello. Title says the jist of it. I recently acquired a '73 Mercury 4hp. Guy I got it from claims he shot some ether in it and it fired though I bought it knowing it wouldn't run and needed carb work. Non-salt water environment. After a rebuild I definitely am not getting any firing. *this is...
Top